Solve for y
y=-\frac{4x^{2}}{5}+4
Solve for x (complex solution)
x=-\frac{\sqrt{20-5y}}{2}
x=\frac{\sqrt{20-5y}}{2}
Solve for x
x=\frac{\sqrt{20-5y}}{2}
x=-\frac{\sqrt{20-5y}}{2}\text{, }y\leq 4
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4x^{2}+5y=20
Multiply both sides of the equation by 20, the least common multiple of 5,4.
5y=20-4x^{2}
Subtract 4x^{2} from both sides.
\frac{5y}{5}=\frac{20-4x^{2}}{5}
Divide both sides by 5.
y=\frac{20-4x^{2}}{5}
Dividing by 5 undoes the multiplication by 5.
y=-\frac{4x^{2}}{5}+4
Divide 20-4x^{2} by 5.
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