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Which of the following points is the intersection between the lines y

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Which of the following points is the intersection between the lines y [#permalink]

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New post 29 Apr 2017, 09:26
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Which of the following points is the intersection between the lines y = 3x + 6 and y = −2x − 4 ?

A. (2,0)
B. (0,−2)
C. (−2,0)
D. (0,2)
E. (1,5)
[Reveal] Spoiler: OA

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Re: Which of the following points is the intersection between the lines y [#permalink]

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New post 29 Apr 2017, 09:31
Solving equations,
5x = -10
x=-2.
Using this value of x in either equations, we get y=0
Hence point of intersection is (-2,0) (Option C)


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Re: Which of the following points is the intersection between the lines y [#permalink]

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SajjadAhmad wrote:
Which of the following points is the intersection between the lines y = 3x + 6 and y = −2x − 4 ?

A. (2,0)
B. (0,−2)
C. (−2,0)
D. (0,2)
E. (1,5)


Solving simultaneous equations:
3x+6 = -2x -4
5x = -10, x = -2 and y = 0

Correction Option: C
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Re: Which of the following points is the intersection between the lines y [#permalink]

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New post 30 Apr 2017, 07:25
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SajjadAhmad wrote:
Which of the following points is the intersection between the lines y = 3x + 6 and y = −2x − 4 ?

A. (2,0)
B. (0,−2)
C. (−2,0)
D. (0,2)
E. (1,5)


The above approaches are all correct/valid, but I'll point out that, once we determine that x = -2, we need not actually calculate the y-value, since only one answer choice has an x-coordinate of -2

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Re: Which of the following points is the intersection between the lines y   [#permalink] 30 Apr 2017, 07:25
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