100-y=81

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Solution for 100-y=81 equation:


Simplifying
100 + -1y = 81

Solving
100 + -1y = 81

Solving for variable 'y'.

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

Add '-100' to each side of the equation.
100 + -100 + -1y = 81 + -100

Combine like terms: 100 + -100 = 0
0 + -1y = 81 + -100
-1y = 81 + -100

Combine like terms: 81 + -100 = -19
-1y = -19

Divide each side by '-1'.
y = 19

Simplifying
y = 19

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