Solve for x
x=4y
Solve for y
y=\frac{x}{4}
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10x-25y-15y=0
Combine 25x and -15x to get 10x.
10x-40y=0
Combine -25y and -15y to get -40y.
10x=40y
Add 40y to both sides. Anything plus zero gives itself.
\frac{10x}{10}=\frac{40y}{10}
Divide both sides by 10.
x=\frac{40y}{10}
Dividing by 10 undoes the multiplication by 10.
x=4y
Divide 40y by 10.
10x-25y-15y=0
Combine 25x and -15x to get 10x.
10x-40y=0
Combine -25y and -15y to get -40y.
-40y=-10x
Subtract 10x from both sides. Anything subtracted from zero gives its negation.
\frac{-40y}{-40}=-\frac{10x}{-40}
Divide both sides by -40.
y=-\frac{10x}{-40}
Dividing by -40 undoes the multiplication by -40.
y=\frac{x}{4}
Divide -10x by -40.
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