A line in the xy-plane passes through $(0, 4)$ and $(3, 13)$. Which equation represents this line?
A$y = 3x + 4$
B$y = 4x + 3$
C$y = 3x - 4$
D$y = 9x + 4$
Answer & Solution
Correct answer: A. $y = 3x + 4$
Slope = $(13 - 4)/(3 - 0) = 9/3 = 3$. The y-intercept is given by the first point as 4. So $y = 3x + 4$. (Distractor: 9 is $\Delta y$ alone, not slope.)
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