Solve for y
y=-\frac{x}{4}+5
Solve for x
x=20-4y
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4y=20-x
Subtract x from both sides.
\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 20-x by 4.
x=20-4y
Subtract 4y from both sides.
Examples
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Matrix
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Limits
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