Question

Find the equation of the line. Use exact numbers.

Answer 1

Answer: $y=4x-9$

Step-by-step explanation:

$y=mx+b$

I know b is -9 because there's where the line crosses the y intersection.

$y=mx-9$

To find ''m'', we can use 2 different methods. I'm going to use one that follows a formula. First, locate two points in the graph.

$(0,-9);(3,3)$

$m=\frac{y_2-y_1}{x_2-x_1}\\ m=\frac{3-(-9)}{3-0}\\ m=\frac{3+9}{3}\\ m=\frac{12}{3}\\ m=4$

$y=4x-9$