4000=-400(0)+b

Solution for 4000=-400(0)+b equation:

Simplifying
4000 = -400(0) + b

Multiply -400 * 0
4000 = 0 + b

Anything times zero is zero.
4000 = 0 + b
Remove the zero:
4000 = b

Solving
4000 = b

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-1b' to each side of the equation.
4000 + -1b = b + -1b

Combine like terms: b + -1b = 0
4000 + -1b = 0

Add '-4000' to each side of the equation.
4000 + -4000 + -1b = 0 + -4000

Combine like terms: 4000 + -4000 = 0
0 + -1b = 0 + -4000
-1b = 0 + -4000

Combine like terms: 0 + -4000 = -4000
-1b = -4000

Divide each side by '-1'.
b = 4000

Simplifying
b = 4000