Solve for x
x=\frac{y}{21}
Solve for y
y=21x
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3x+2y-45x=0
Subtract 45x from both sides.
-42x+2y=0
Combine 3x and -45x to get -42x.
-42x=-2y
Subtract 2y from both sides. Anything subtracted from zero gives its negation.
\frac{-42x}{-42}=-\frac{2y}{-42}
Divide both sides by -42.
x=-\frac{2y}{-42}
Dividing by -42 undoes the multiplication by -42.
x=\frac{y}{21}
Divide -2y by -42.
2y=45x-3x
Subtract 3x from both sides.
2y=42x
Combine 45x and -3x to get 42x.
\frac{2y}{2}=\frac{42x}{2}
Divide both sides by 2.
y=\frac{42x}{2}
Dividing by 2 undoes the multiplication by 2.
y=21x
Divide 42x by 2.
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