Solve for x
x=-\frac{y}{5}+40
Solve for y
y=200-5x
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y=4x+720-9x-520
Use the distributive property to multiply 9 by 80-x.
y=-5x+720-520
Combine 4x and -9x to get -5x.
y=-5x+200
Subtract 520 from 720 to get 200.
-5x+200=y
Swap sides so that all variable terms are on the left hand side.
-5x=y-200
Subtract 200 from both sides.
\frac{-5x}{-5}=\frac{y-200}{-5}
Divide both sides by -5.
x=\frac{y-200}{-5}
Dividing by -5 undoes the multiplication by -5.
x=-\frac{y}{5}+40
Divide y-200 by -5.
y=4x+720-9x-520
Use the distributive property to multiply 9 by 80-x.
y=-5x+720-520
Combine 4x and -9x to get -5x.
y=-5x+200
Subtract 520 from 720 to get 200.
Examples
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Matrix
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Simultaneous equation
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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