Parallel Lines - GMAT Quantitative

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Question

Find the equation of a line that is parallel to and passes through the point .

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Answer

The parallel line has the equation 4x-2y=5. We can find the slope by putting the equation into slope-intercept form, y = mx + b, where m is the slope and b is the intercept. 4x-2y=5 becomes y=2x-$\frac{5}{2}$, so the slope is 2.

We know that our line must have an equation that looks like y=2x+b. Now we need the intercept. We can solve for b by plugging in the point (4, 1).

1 = 2(4) + b

b = –7

Then the line in question is y=2x-7.

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