Solve for y
y=-4
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\left(y-5\right)\times 4=y\times 9
Variable y cannot be equal to any of the values 0,5 since division by zero is not defined. Multiply both sides of the equation by y\left(y-5\right), the least common multiple of y,y-5.
4y-20=y\times 9
Use the distributive property to multiply y-5 by 4.
4y-20-y\times 9=0
Subtract y\times 9 from both sides.
-5y-20=0
Combine 4y and -y\times 9 to get -5y.
-5y=20
Add 20 to both sides. Anything plus zero gives itself.
y=\frac{20}{-5}
Divide both sides by -5.
y=-4
Divide 20 by -5 to get -4.
Examples
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y = 3x + 4
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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