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# A straight line in the XY-plane has a slope of 3 and a Y-intercept of

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Math Expert
Joined: 02 Sep 2009
Posts: 58400
A straight line in the XY-plane has a slope of 3 and a Y-intercept of  [#permalink]

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16 Oct 2018, 04:50
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Difficulty:

5% (low)

Question Stats:

91% (00:44) correct 9% (00:43) wrong based on 48 sessions

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A straight line in the XY-plane has a slope of 3 and a Y-intercept of 4. On this line, what is the X-coordinate of the point whose Y-coordinate is 10?

(A) 2
(B) 4
(C) 6
(D) 7
(E) 7.5

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Re: A straight line in the XY-plane has a slope of 3 and a Y-intercept of  [#permalink]

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16 Oct 2018, 05:14
Bunuel wrote:
A straight line in the XY-plane has a slope of 3 and a Y-intercept of 4. On this line, what is the X-coordinate of the point whose Y-coordinate is 10?

(A) 2
(B) 4
(C) 6
(D) 7
(E) 7.5

Slope = 3

Y- Intercept = 4

i.e. Equation of line, y = mx +c becomes

y = 3x + 4

@y = 10

10 = 3x+4

i.e. x = 2

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Re: A straight line in the XY-plane has a slope of 3 and a Y-intercept of   [#permalink] 16 Oct 2018, 05:14
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