Answer: (Attached picture)
Explanation:
Isolate y to form your equation, which is y = mx + b
3x + 5y = -15
3x + 5y -3x = -15 - 3x
5y = -15 - 3x
5y/5 = -15/5 - 3x/5
y = -3 - 3x/5
Rearrange: -3/5x -3 = y
Now graph: -3 is the y intersection and -3/5 is the slope.