How do I show my work on this question

Answer:
Find two points on the line, then find the slope
Then using one of the two points, solve for b. (y intercept)
Step-by-step explanation:
Two points: (-3,-3) (-1,3)
3 - (-3) = 6
-1 - (-3) = 2
6/2 = 3. (slope)
y = 3x + b
Choosing (-1,3)
3 = 3(-1) + b
3 = -3 + b
6 = b