81=4y+9

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Solution for 81=4y+9 equation:


Simplifying
81 = 4y + 9

Reorder the terms:
81 = 9 + 4y

Solving
81 = 9 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
81 + -4y = 9 + 4y + -4y

Combine like terms: 4y + -4y = 0
81 + -4y = 9 + 0
81 + -4y = 9

Add '-81' to each side of the equation.
81 + -81 + -4y = 9 + -81

Combine like terms: 81 + -81 = 0
0 + -4y = 9 + -81
-4y = 9 + -81

Combine like terms: 9 + -81 = -72
-4y = -72

Divide each side by '-4'.
y = 18

Simplifying
y = 18

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