9=4(0)+b

Solution for 9=4(0)+b equation:

Simplifying
9 = 4(0) + b

Multiply 4 * 0
9 = 0 + b

Anything times zero is zero.
9 = 0 + b
Remove the zero:
9 = b

Solving
9 = 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.
9 + -1b = b + -1b

Combine like terms: b + -1b = 0
9 + -1b = 0

Add '-9' to each side of the equation.
9 + -9 + -1b = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1b = 0 + -9
-1b = 0 + -9

Combine like terms: 0 + -9 = -9
-1b = -9

Divide each side by '-1'.
b = 9

Simplifying
b = 9