Solve for d
d=35-5y
Solve for y
y=-\frac{d}{5}+7
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3d=105-15y
Subtract 15y from both sides.
\frac{3d}{3}=\frac{105-15y}{3}
Divide both sides by 3.
d=\frac{105-15y}{3}
Dividing by 3 undoes the multiplication by 3.
d=35-5y
Divide 105-15y by 3.
15y=105-3d
Subtract 3d from both sides.
\frac{15y}{15}=\frac{105-3d}{15}
Divide both sides by 15.
y=\frac{105-3d}{15}
Dividing by 15 undoes the multiplication by 15.
y=-\frac{d}{5}+7
Divide 105-3d by 15.
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