To find the slope, you want to see how you’d get from the point at (-3,-2), to the point at (0,-7). You’d go “down5, right 3”. This gives you a slope of -5/3.
Next you need the b-value. This is the -7 from the y-intercept (0,-7).
Putting that together for the y=mx+b form, you’d have y = -5/3 - 7.
Here’s a video that also walks through the steps: https://youtu.be/eAbG5DZqwyg?list=PLmuZCPhWPt-cR9nhDJcByg3_HALa8sSwp
