Solve for x
x=20-4y
Solve for y
y=-\frac{x}{4}+5
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2\times 2y-20=-x
Multiply both sides of the equation by 4, the least common multiple of 2,4.
4y-20=-x
Multiply 2 and 2 to get 4.
-x=4y-20
Swap sides so that all variable terms are on the left hand side.
\frac{-x}{-1}=\frac{4y-20}{-1}
Divide both sides by -1.
x=\frac{4y-20}{-1}
Dividing by -1 undoes the multiplication by -1.
x=20-4y
Divide -20+4y by -1.
2\times 2y-20=-x
Multiply both sides of the equation by 4, the least common multiple of 2,4.
4y-20=-x
Multiply 2 and 2 to get 4.
4y=-x+20
Add 20 to both sides.
4y=20-x
The equation is in standard form.
\frac{4y}{4}=\frac{20-x}{4}
Divide both sides by 4.
y=\frac{20-x}{4}
Dividing by 4 undoes the multiplication by 4.
y=-\frac{x}{4}+5
Divide -x+20 by 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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