4(y-1)+5(y+1)=100

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Solution for 4(y-1)+5(y+1)=100 equation:


Simplifying
4(y + -1) + 5(y + 1) = 100

Reorder the terms:
4(-1 + y) + 5(y + 1) = 100
(-1 * 4 + y * 4) + 5(y + 1) = 100
(-4 + 4y) + 5(y + 1) = 100

Reorder the terms:
-4 + 4y + 5(1 + y) = 100
-4 + 4y + (1 * 5 + y * 5) = 100
-4 + 4y + (5 + 5y) = 100

Reorder the terms:
-4 + 5 + 4y + 5y = 100

Combine like terms: -4 + 5 = 1
1 + 4y + 5y = 100

Combine like terms: 4y + 5y = 9y
1 + 9y = 100

Solving
1 + 9y = 100

Solving for variable 'y'.

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

Add '-1' to each side of the equation.
1 + -1 + 9y = 100 + -1

Combine like terms: 1 + -1 = 0
0 + 9y = 100 + -1
9y = 100 + -1

Combine like terms: 100 + -1 = 99
9y = 99

Divide each side by '9'.
y = 11

Simplifying
y = 11

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