4=-2(-1)+b

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Solution for 4=-2(-1)+b equation:


Simplifying
4 = -2(-1) + b

Multiply -2 * -1
4 = 2 + b

Solving
4 = 2 + 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.
4 + -1b = 2 + b + -1b

Combine like terms: b + -1b = 0
4 + -1b = 2 + 0
4 + -1b = 2

Add '-4' to each side of the equation.
4 + -4 + -1b = 2 + -4

Combine like terms: 4 + -4 = 0
0 + -1b = 2 + -4
-1b = 2 + -4

Combine like terms: 2 + -4 = -2
-1b = -2

Divide each side by '-1'.
b = 2

Simplifying
b = 2

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