Question

What is the equation for the line that passes through (1,2) and (0,-1)?A) y=x-3B) y=-x+3C) y=-3x+1D) y=3x-1

Answer 1

First, we use the slope formula.

$m=\frac{y_2-y_1}{x_2-x_1}$

Let's replace the given points

$m=\frac{-1-2}{0-1}=\frac{-3}{-1}=3$

Remember that the slope is the coefficient of x.

Hence, the answer is D because it's the only equation with a slope of 3.