## MaeganR Group Title Point-Slope Form: "Graph each equation." one year ago one year ago

1. MaeganR Group Title

#5. y-2=2(x+3) #6. y+3=-2(x+1) #7. y+1=-3/5(x+5)

2. DHASHNI Group Title

|dw:1358042338363:dw|

3. MaeganR Group Title

How do you show your work?

4. DHASHNI Group Title

i made a mistake !!!!!

5. MaeganR Group Title

:O

6. DHASHNI Group Title

buts its k i'll tell u how to plot

7. MaeganR Group Title

yeah i need to show my work too

8. DHASHNI Group Title

for the given equation u got to make up a table for getting the points

9. MaeganR Group Title

huh.?

10. MaeganR Group Title

?

11. DHASHNI Group Title

for the given equation u got to make up a table for getting the points when u put x=0 in the given equation y value becomes 8 so , (0,8) is one of the points in the given straight line when u put y=0 in the given equation x value becomes 3 so, (3,0 ) is also one of the points in the given straight line|dw:1358043164412:dw|

12. DHASHNI Group Title

|dw:1358043209533:dw|

13. DHASHNI Group Title

and for the rest equation do the same u'll easily get plotted!

14. MaeganR Group Title

what the. im forever stupid. i hate math.

15. DHASHNI Group Title

huh.?

16. MaeganR Group Title

im so confused.

17. Azteck Group Title

#5. $y=2x+8$ #6. $y=-2x-5$ #7.$y=-\frac{ 3 }{ 5 }-4$ |dw:1358111862798:dw| |dw:1358111959201:dw|

18. Azteck Group Title

The #7 had a mistype. $y=-\frac{ 3 }{ 5 }x-4$ forgot the x.

19. MaeganR Group Title

How do you do that?

20. Azteck Group Title

Make sure when you draw the graphs, include the corresponding equation next to the line.

21. Azteck Group Title

Okay, please specify. Are you stuck with getting the equations into intercept form or are you stuck with the sketching onto the graph?

22. Azteck Group Title

Just to let you know I purposely haven't done #7 just to see where your mind is at. So if you're stuck with sketching we can go through #7 together as an example to make sure you understand.

23. Azteck Group Title

purposely didn't do*

24. MaeganR Group Title

#5 this is what I got when I did it: y -2= 2(x+3) 1 - 2 +2(1+3) 1-2=2(4) 1-2=8 (-8,-1)

25. MaeganR Group Title

1-2=2(1+3) Ooops.^

26. Azteck Group Title

okay, don't do that. That's a very slow way of sketching them. I got used to a method, where once you learn it completely, you can sketch the equation straight away in 10 seconds after looking at the equation.

27. MaeganR Group Title

how do you do that? and btw: is that correct anyways?

28. MaeganR Group Title

?

29. Azteck Group Title

Okay, do you know how to put the equations in to point intercept form?

30. Azteck Group Title

y=mx+b where m is the gradient of the line, b is a constant.

31. MaeganR Group Title

y=mx+b is the formula, but i dont know how to do anything

32. Azteck Group Title

Okay, good.

33. Azteck Group Title

Do you know how to expand?

34. MaeganR Group Title

m is the slope ik that

35. MaeganR Group Title

what is expanding?

36. Azteck Group Title

Ah, okay. Now that is something your teacher should have taught you before all this sketching and stuff.

37. MaeganR Group Title

my teacher just teaches everything in the book. in fact, we dont even use books. she just teaches us on the board and thats how we "LEARN".

38. Azteck Group Title

#5. y-2=2(x+3) Expand this part: $2(x+3)$

39. Azteck Group Title

Don't you know how to remove the brackets?

40. MaeganR Group Title

is it also called distribute?

41. MaeganR Group Title

what is a bracket?

42. MaeganR Group Title

[]?

43. Azteck Group Title

I think so. Because I'm probably not from your country where you might teach differently. I meant paranthesis. I just call it brackets because it's maths and maths teachers don't care about the technical terms of that stuff.

44. Azteck Group Title

Okay, If you expand/distribute $2(x+3)$ Wouldn't you get $2(x)+2(3)$

45. Azteck Group Title

and then you get $2x+6$

46. MaeganR Group Title

yesh brb

47. MaeganR Group Title

ok so hi

48. MaeganR Group Title

#5. y-2=2(x+3) How do we do this?

49. Azteck Group Title

okay now, you have y-2=2x+6

50. MaeganR Group Title

yes

51. Azteck Group Title

you want to put that into y=mx+b. Wouldn't you have to move the -2 to the LHS(Left Hand Side)?

52. MaeganR Group Title

wait how do you get the y+3 to be y-2?

53. Azteck Group Title

what? where's that?

54. Azteck Group Title

You're looking at the second one. I'm at the first one.

55. MaeganR Group Title

nvm. sorrry i was looking at two different problems.

56. MaeganR Group Title

yeah lol

57. Azteck Group Title

Okay, so put $y-2=2x+6$ into this form y=mx+b

58. MaeganR Group Title

is 2 m or is 6 m? 2?

59. MaeganR Group Title

because 6 would be b right?

60. Azteck Group Title

You're confusing me and we haven't started doing the other parts yet. Look at $y−2=2x+6$

61. Azteck Group Title

Now tell me what's the difference between this when you disregard the m's and b's in this equation: $y=mx+b$

62. MaeganR Group Title

y=x?

63. Azteck Group Title

Okay. Have you played a game called Spot The Difference? You're trying to find the difference between that equation and the first one.

64. Azteck Group Title

Come'on, this is the easiest form of mathematics at a standard level. You must know this in order to continue.

65. Azteck Group Title

Okay, here's something you should know. Collect the like terms.

66. Azteck Group Title

Do you know what collecting like terms is? Or have you not paid attention in class for a few years?

67. MaeganR Group Title

Ok. This is what ive done if it helps any.

68. MaeganR Group Title

and its backwards.

69. Azteck Group Title

That's going to be hard to read don't you think. Okay, I'm asking you this sole question.

70. MaeganR Group Title

The teacher I have does not explain, she only gives us frayer diagrams to follow. This is why this is so confusing to me.

71. Azteck Group Title

Do you understand the statement: "Collecting like terms"

72. MaeganR Group Title

yeah

73. MaeganR Group Title

is y=2x+8 anything to do with the answer?

74. Azteck Group Title

Yes!! Great work!!!

75. Azteck Group Title

Now, this is the easy part. That's what I think.

76. MaeganR Group Title

so now what do i do to get it to be point-slope form?

77. Azteck Group Title

All you have to do when sketching is find the x and y intercepts!

78. Azteck Group Title

That is point-slope form?

79. MaeganR Group Title

ok so i can plug in like (1,1) and (3,3)?

80. Azteck Group Title

No!!!

81. MaeganR Group Title

y=2x+8 is slope-intercept form. I need it to be point-slope form which is y-y1=m(x-x1). Wait.. I think i know how to do that..

82. Azteck Group Title

Always when sketching lines, you start off by making x=0

83. Azteck Group Title

so that means, you substitute x with 0!

84. Azteck Group Title

y=2(0)+ 8

85. Azteck Group Title

Anything multiplied by 0 always gives you zero!!

86. Azteck Group Title

Now you found that when you substitute x with 0 you get y=8

87. Azteck Group Title

And your coordinates would be (0, 8). Because coordinates always look like this: (x, y)

88. MaeganR Group Title

i get it. y=2x+8 y=2(0)+8 y=0+8 y=8 !!! :D

89. Azteck Group Title

Yes!! Now that's called finding the y-intercept. What would you do to find the x-intercept? How would you eliminate y in order to find x?

90. MaeganR Group Title

whoa. whoa. whoa. hold up. let me think...

91. MaeganR Group Title

you would plug in 0 for y?

92. Azteck Group Title

WELL DONE! awesome job @MaeganR!

93. Azteck Group Title

So what would you get for x?

94. Azteck Group Title

when you plug in 0 into y?

95. MaeganR Group Title

let me solve it..

96. MaeganR Group Title

0=2x+8 is how you start right.?

97. Azteck Group Title

Yes.

98. MaeganR Group Title

-4=x !?!?!?!

99. Azteck Group Title

Yes!!!Correct!!

100. MaeganR Group Title

so it would be (-4,8) but how do you go up or down.?

101. Azteck Group Title

so now what would the co-ordinates of the x-intercept be? Remember the coordinates take in the shape of this: (x-value, y-value)

102. Azteck Group Title

Yes!

103. MaeganR Group Title

wait. slope=2 2/1 up 2 over 1?

104. Azteck Group Title

No!! Don't do that.

105. Azteck Group Title

Forget the slope when sketching.

106. MaeganR Group Title

but htats what my teacher says to do? ):

107. Azteck Group Title

Haha, when you go up to senior years, all you do is put important features when sketching. The sketch doesn't need to be 00% perfect and to scale.

108. Azteck Group Title

100%

109. MaeganR Group Title

im in 7th grade advanced, so were taking a 9th grade class in 7th grade. legit, no joke

110. MaeganR Group Title

oh. oh. oh. I get it.

111. Azteck Group Title

Then if you're in 7th grade advanced, you should be smart as hell. Taking a 9th grade class when you're in 7th grade would require some form of intelligence and dexterity at mathematics. You should know allt his because this is 7th grade maths.

112. MaeganR Group Title

so (-4,0) and (0,-8)!?!?!?!?!

113. Azteck Group Title

Yes.

114. Azteck Group Title

Now run run a line along the two points

115. Azteck Group Title

You don't need to be precise in your placement of the coordinates.

116. Azteck Group Title

but make sure the x and y intecept are on the x and y axis respectively.

117. MaeganR Group Title

118. Azteck Group Title

Why are you skipping grades with this limited knowledge of maths? If you keep going at this rate, you're on the road to failure.

119. Azteck Group Title

That's my 2 cents.

120. MaeganR Group Title

yay. thank you so much. ive been so frustrated for a month because nobody would actually take the time to explain the whole thing to me in unbig scarey words. thank you so much. :)

121. Azteck Group Title

No worries. I think keeping it simple and just using baby talk always makes more sense than sophisticated and complicated words.

122. MaeganR Group Title

because i have to do this. theres no way out of the advanced program. once the school puts you in it without youre choice youre there, whether you fail or not.

123. MaeganR Group Title

yeah. always^.

124. MaeganR Group Title

im going to close the question now, but you can message me(: