## goldyyy 2 years ago anybody wanna help?

1. goldyyy

2. goldyyy

?

3. Heyy_Girl_Heyy

The answer is D. I know this because all you have to do is use a calculator, and fill in the x and y values in the equation from your answers, and see which one adds upp..(:

4. tanvirms

in an ordered pair, the first number is the value of x and the second one is y, so, just put the value of x and y and see which gets u 5 ..... *sshhh* its the last one :P

5. goldyyy

ok thanks! i have more questions if you want?! :)

6. Heyy_Girl_Heyy

You should totally give me best response and I will help you(:

7. tanvirms

@Heyy_Girl_Heyy errmm...u might wanna check your calculator again, its not D.

8. goldyyy

wait so is it the last one? @Heyy_Girl_Heyy @tanvirms

9. Heyy_Girl_Heyy

Umm, yeah. It kinda is

10. goldyyy

D?

11. tanvirms

yes.... 2.(3) + (-1) = 5 or, 6-1=5 or, 5=5

12. Heyy_Girl_Heyy

Yes. Fill in the numbers and see what you get.

13. Heyy_Girl_Heyy

So @tanvirms , How was I wrong?

14. tanvirms

@Heyy_Girl_Heyy its the last one, E :) put the values yourself and check.

15. Heyy_Girl_Heyy

Yeah, that's what I said.

16. goldyyy

YOU GUYS ARE CONFUSING ME lol

17. Heyy_Girl_Heyy

The answer is the last equation

18. tanvirms

@Heyy_Girl_Heyy hey im totally sorry :P i messed it up with someone else's question with 5 options....it has 4...sorry!!!!

19. AngelicDragon

OMG peoples. It's (3,-1)

20. Heyy_Girl_Heyy

Lol, you're okay. I understand..

21. goldyyy

ahahha anyways here's the 2nd question

22. Heyy_Girl_Heyy

(2,-2)

23. AngelicDragon

2,-2

24. Heyy_Girl_Heyy

I got this.

25. AngelicDragon

LOL!! I sent when yours came in

26. tanvirms

@goldyyy seriously?? just count!!! 2 on the right means 2, and two down means -2, so its (2,-2)

27. AngelicDragon

LOL!!!

28. goldyyy

number 3................ and @tanvirms i wasn't looking at the questions i'm just posting them :P

29. Heyy_Girl_Heyy

@goldyyy , do you go to Connections Axademy?

30. tanvirms

@goldyyy :P if you look at em, im sure you wont find any that u cant solve.

31. goldyyy

i go to ohio virtual academy @Heyy_Girl_Heyy

32. AngelicDragon

I'm gonna agree with @tanvirms on this at least look at em first

33. Heyy_Girl_Heyy

It is just like the other problem, figgure it out/

34. Heyy_Girl_Heyy

Just fill in the answer choices into the x and y values. See which one adds up.

35. goldyyy

sorryyyy wasn't looking at them :/ but i'll look at 'em now and i'll post the ones i don't know

36. Heyy_Girl_Heyy

Okay.

37. goldyyy

well idk this one cuz i don't get slopes :/

38. Heyy_Girl_Heyy

I can explain slopes if you want me to

39. Heyy_Girl_Heyy

I know the answer, but I want to make sure you UNDERSTAND the material.

40. goldyyy

okay

41. tanvirms

it ascends from left to right, which means it has a positive slope...with this info, u can eliminate 2 answer choices :) (elimination is a wonderful strategy for SAT)

42. AngelicDragon

rise/run from one point to the next: how many units up (if its down its negative) over how many units right (left means negative)

43. Heyy_Girl_Heyy

Okay, so when you are doing slope, you use rise over run. Rise is the up or down along the grid, and run is side to side across the grid. So you will measure you r rise )Up or down motion) as opposed to your run(Side to side motion) count how many there are and thats your answer

44. Heyy_Girl_Heyy

O meant how ever many units up or down and across from each point is your answer.

45. goldyyy

is it 4?

46. AngelicDragon

equation for slope: $m = \frac{ y_{2}–y_{1} }{x_{2}–x_{1}}$

47. Heyy_Girl_Heyy

No, it will be in the form of a frac tion

48. goldyyy

so is it always in fraction form?

49. Heyy_Girl_Heyy

Most times.

50. goldyyy

1/4?

51. Heyy_Girl_Heyy

Yeah.!

52. tanvirms

it doesnt need to be fraction...it can be any number.

53. Heyy_Girl_Heyy

Well, in this case it would be a fraction, correct?

54. tanvirms

yup...basically, when the run is greater than the rise, it has a chance to be a fraction.

55. goldyyy

and for number 3, i tried all the answers but they all equaled 24 or -24 and 26 or -26

56. goldyyy

yes

57. Heyy_Girl_Heyy

hmm, the same thing happened with me. I am not sure.

58. tanvirms

intercept is the point where the straight line cuts the axis...so, x intercept means that value of x for which y=0, and y intercept means that value of y for which x=0....try solving

59. tanvirms

wait i'll show u...

60. Heyy_Girl_Heyy

No, she is tal;king about #3 @tanvirms

61. tanvirms

that's what im talking about too

62. goldyyy

would it be B because the answer is -12 and B's answer is -24 which is double?

63. tanvirms

2x-3y=-12, or, -3y=-2x-12 pr. 3y=2x+12 or, y=(2x+12)/3 now, find that value of x for which y would be 0. in this case, it is -6.... (-12+12)/3=0 similaryl, 2x=3y-12 or, x=(3y-12)/2 for y=4, x=0....so the correct answer is B,

64. goldyyy

yes so i was right! what about these?

65. goldyyy

last one got cut off so here

66. tanvirms

for the first one, do that same as @Heyy_Girl_Heyy taught u a while ago... for the second one, all u have to do is get the equation in y=mx+c form so, 4x+9y=36 or, 9y=-4x+36 or, y=-4/9.x + 36/9 or, y=-4/9.x+4

67. goldyyy

68. goldyyy

69. goldyyy

70. goldyyy

71. goldyyy

72. goldyyy

73. goldyyy

@Heyy_Girl_Heyy @tanvirms @AngelicDragon ?? :D

74. Heyy_Girl_Heyy

I am kinda busy right now.

75. AngelicDragon

7. is b

76. AngelicDragon

sorry i was busy a second ago

77. goldyyy

ohh ok @AngelicDragon thanks

78. AngelicDragon

You know if you have a graphing utility on your computer that can be a lot of help to you with a lot of these

79. goldyyy

i don't have one :/ i have to do something real quick so i'll be back in like 20 minutes

80. AngelicDragon

that's a good way to get them done fast in fact that's what I do

81. goldyyy

yeah :)

82. AngelicDragon

you can use Geogebra it's an online graphing thing

83. goldyyy

brb in 20 mins! :)

84. goldyyy

back! @AngelicDragon

85. tanvirms

Q.9---what is the relationship between these two lines: 3x+6y=8 y=2x-8 as i said, try to transform the equation into y=mx+b form, the second one is already done...lets go with the first one. 3x+6y=8 or, 6y=-3x+8 or, y= -3/6.x + 8/6 or, y= -1/2.x + 4/3 what u wanna look at now is the part with x (the 'm' part in y=mx+b) and in this case it is -1/2 (u have to take it with the sign)....it is the 'slope' in case of y=2x-8 slope, m is 2, right? whats the relationship between 2 and -1/2?? -1/2 is the reciprocal of 2 with the opposite sign (u know what a reciprocal fraction is, right?) when one straight line has a reciprocal slope with the opposite sign in respect to another straight line, they are perpendicular to each other. i hope this explains.

86. tanvirms

Q. which has a slope of 5 and y intercept of -3? all of these equations are in intercept form. ( y=mx+b as i said) m is the slope b is the y intercept so what u are looking for is an equation that has m=5, b=-3 look for it!!

87. tanvirms

Q. which one is graph of inequality y<2x+3 the shaded part is the part that denotes the inequality, i guess u already know that. if there's a straight line between the shaded part and the white part, there should be a = sign in the equation....you dont see any '=' in the equation, do you? in that case, you can just eliminate B. now, the best way is to take a (x,y) pair. and the easiest to work with is the (0.0) pair. substitute the values of x and y here. 0<2.0+3 or, 0<3 which is totally true (0,0) lies in the shaded part of C, so C is the answer. sometimes, you might also have to check some other pairs (1,1) or something else too, just to be sure. if you'r wondering whether A is correct or not, take a point that lies in the shaded part, lets say it is (-2,4) (its in the shaded part, check out) 4<2.(-2)+3 or, 4<-4+3 or, 4<-1 apparently, 4 can never be less than -1. so there you go...its not A, not B...its C.

88. tanvirms

i believe we already worked on 5 and 6 a while ago...check. Q.7---a line that passes through (-2,1) and has a slope of 5. if my earlier explanations were clear enough, i believe you already know that only option A and B has a slope of 3 now, check them with the pair (-2,1). you wanna put x=-2 and y=1 and see if its true. for A, (1+1)=3(-2+2) or, 2=0 TOTALLY WRONG! for B, (1-1)=3(-2+2) or 0=0 there you go!! Q.8: what is the slope of the line parallel to 2x-3y=6 find the slope first. -3y=-2x+6 or, 3y=2x-6 or, y=2/3.x-2 so, the slope is 2/3, right?? remember what i told you a while ago? perpendicular lines have a reciprocal and opposite signed slope..... in case of parallel lines, they have the same slope. so, the answer is 2/3..

89. tanvirms

finally, i'm sorry for the late replies. i'm from Bangladesh and our time zones are totally different. it was like 2 AM in the morning and i went to bed (not to mention, i got struck by AlterBridge too. listened to them over and over again till 4 xD ).