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anonymous one year ago Find the solution(s) to the following system of equations: y = 5 y = 3x - 4 Write answer as an ordered pair(s). Separate by a comma if more than one solution. what is the x ordered pair

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1. DanJS

If y = A and y = B, then set A = B, solve for the X value

2. DanJS

5 = 3x - 4

3. anonymous

I got -1 ?

4. DanJS

5 + 4 = 3x - 4 + 4 9 = 3x x = 3 y = 5 is already given

5. anonymous

the answer that I have is 3,5 but it's wrong

6. DanJS

the point (3,5) is where the two lines intersect

7. anonymous

I got 239?

8. UsukiDoll

how is (3,5) wrong though? It does satisfy both equations

9. anonymous

the y axis is right but the x axis isn't

10. DanJS

are you trying to put this in a computer test

11. UsukiDoll

could be mymathlab stuff ?! that was horrible when I took Calculus II

12. DanJS

you said you put 3,5 try (3,5)

13. anonymous

I have in like that (3,5)

14. UsukiDoll

some sites are so super sensitive even though you have the right answer.

15. UsukiDoll

what site are you using @Aliypop ?

16. anonymous

It's called Moodel

17. anonymous

The y-coordinate is correct. Check the x again by graphing the system. thats the reply my teacher left

18. UsukiDoll

omg..... that means we have to use the graphing method

19. UsukiDoll

I would put a side note.... yo man solving for x helps too ...there's more than one method to solve a problem as long as it doesn't break math rules geez.

20. UsukiDoll

so I guess we have to graph y = 5 and y = 3x-4 -_-

21. anonymous

okay

22. UsukiDoll

so y = 5 means that our x is set at 0 so draw a horizontal line at (0,5)

23. anonymous

okay

24. UsukiDoll

and then for y = 3x-4 we have to let x be any number like x = 0,1,2,3 solve for y and plot points

25. anonymous

ok

26. UsukiDoll

that's about it.. if x = 3 there should be intersection... honestly... more than one method works... wow.

27. UsukiDoll

I'm just peeved at what your teacher wrote like... dude come on

28. anonymous

my teacher isn't the best I'm serious

29. UsukiDoll

yeah it already shows smh

30. anonymous

this is just a summer school class and I'm almost done I'm ahead of the class and she go upset about it

31. UsukiDoll

LOL! XD

32. UsukiDoll

what was her reason to be upset at you though?

33. anonymous

because 1 I was far ahead of the class , I came from a online home school so I'm usually ahead of my classes anyways

34. UsukiDoll

that's good.

35. UsukiDoll

getting ahead is the best thing ever...even I got blasted for being ahead in my computer classes but I just didn't care about what my professors said.

36. anonymous

but i'm going to public high school they want me to finish on pace with the rest, also is the answer 0,5

37. UsukiDoll

hmmm... if we're going to use the graphing method we have to graph y = 5 which is a horizontal line. Since x isn't given, it's already 0. so we have a horizontal line at (0,5) then for y=3x-4 we let x = 0,1,2,3... and solve for y to get points. we then use that information to graph until we find the point of intersection with is (3,5)

38. UsukiDoll

it is supposed to be (3,5) that's the point of intersection.... but since it's the graphing method instead of substitution method then we graph 2 lines.

39. UsukiDoll

did you graph y = 5 and y = 3x-4 ?

40. anonymous

I had gotten -2

41. UsukiDoll

oh were you solving for y =3x-4 by letting x = 0,1,2,3 ?

42. anonymous

I got -3 with zero

43. UsukiDoll

wait... for y = 3x-4 (just focus on that equation...nevermind the y =5) if x = 0 then y = -4...so we have one point (0,-4)

44. UsukiDoll

|dw:1437396892108:dw|

45. UsukiDoll

I'll just graph y = 5 and we can solve y =3x-4 together so we got one point already which is (0,-4) |dw:1437396951979:dw|

46. anonymous

so is it -4 ?

47. UsukiDoll

yeah for y = 3x-4 x = 0 plug that in to the equation and we have y = -4

48. UsukiDoll

now let's try x = 1 plug in x = 1 into y =3x-4 y =3(1)-4 can you solve further?

49. anonymous

i got -1

50. UsukiDoll

good so when x = 1, y = -1 another point (1,-1)|dw:1437397160711:dw|

51. UsukiDoll

for y = 3x-4 let x = 2 so plugging x = 2 into the equation y =3x-4 we have y=3(2)-4 and our y is ?

52. anonymous

2

53. UsukiDoll

yes so (2,2) another point |dw:1437397289276:dw|

54. UsukiDoll

and we already solved when x = 3 |dw:1437397314401:dw|

55. anonymous

so it would be (-3,5)?

56. UsukiDoll

that drawing sucks by the way x( it should be (3,5) the point of intersection which is the solution to those 2 equations

57. UsukiDoll

58. anonymous

so it's (0,5)

59. UsukiDoll

(0,5) for y = 5 yes. It's just a horizontal line

60. anonymous

thank you for helping me :D

61. anonymous

oh wait XD sorry I read something wrong

62. anonymous

we're still solving for x right ?

63. UsukiDoll

I don't think so.. when we did y =3x-4 we let x be any number we choose until we find the point which draws the line further to intersecting the other line. In this case when our x =3, our y = 5 since we have a horizontal line y =5 that point (3,5) from y =3x-4 crossed the horizontal line y = 5

64. UsukiDoll

as soon as we reach a certain x value that produces a point of intersection, we're done. If we have perpendicular lines (two lines that intersect) that means that there is one solution. 2 parallel lines means no solution.

65. anonymous

so it is (0,5) I know i asked that a couple times I just wanted to make sure

66. UsukiDoll

is that for graphing y = 5 only? then yes it's (0,5) on the x-axis it's 0.. so x = 0 and y = 5 at point (0,5) the horizontal line is drawn

67. anonymous

okay

68. anonymous

I have to submit the quiz so she can grade it yet again

69. UsukiDoll

good luck.

70. anonymous

thank you

71. UsukiDoll

:)

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