Answer:
y = 4x + (-9)
Step-by-step explanation:
You can observe that the line crosses the y-axis at -9, so that is our y-intercept.
For the slope, just take the y-intercept for example, and count how many squares the line goes up before reaching 1. In this problem you can see that the line goes 4 squares up in the time it takes to go 1 square to the right, so the slope is y over x, meaning 4 over 1, or just 4.
