Solve for x
x=\frac{78-2y}{5}
Solve for y
y=-\frac{5x}{2}+39
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4x=62.4-1.6y
Subtract 1.6y from both sides.
4x=\frac{312-8y}{5}
The equation is in standard form.
\frac{4x}{4}=\frac{312-8y}{4\times 5}
Divide both sides by 4.
x=\frac{312-8y}{4\times 5}
Dividing by 4 undoes the multiplication by 4.
x=\frac{78-2y}{5}
Divide \frac{312-8y}{5} by 4.
1.6y=62.4-4x
Subtract 4x from both sides.
\frac{1.6y}{1.6}=\frac{62.4-4x}{1.6}
Divide both sides of the equation by 1.6, which is the same as multiplying both sides by the reciprocal of the fraction.
y=\frac{62.4-4x}{1.6}
Dividing by 1.6 undoes the multiplication by 1.6.
y=-\frac{5x}{2}+39
Divide 62.4-4x by 1.6 by multiplying 62.4-4x by the reciprocal of 1.6.
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