Test 9 Section 4 Question 15

In this question, we’re given two points on a line and asked to find the equation. Conveniently, the line equations are in y=mx+b form, AKA slope-intercept form, so we can start by finding the slo—WAIT A MINUTE!

One of the points we’re given is (0,1), which is the line’s y-intercept! Look at the answer choices—how many of them have 1 as the y-intercept?

Only choice D! We’re done here.

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If more than one choice had a y-intercept of 1, you’d find the slope thusly: \text{slope}=\dfrac{y_2-y_1}{x_2-x_1}=\dfrac{4-1}{2-0}=\dfrac{3}{2}

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