Answer: 0 = -4x + b
Step-by-step explanation: Write -4x as -4 over 1 (-4/1) and using rise over run you move down 4 and right 1. Then you move up 4 and left 1. Plot those two points where you stopped. That doesn't matter though in this case, you only need the equation.
Answer:

or
9÷d
Hopefully this is what you're looking for.
Answer:
x = 5
Step-by-step explanation:
-3x = 15
---- ----
-3 -3
x = 5