Solve for x
x=\frac{y-180}{21}
Solve for y
y=21x+180
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y=30x-\left(9x-180\right)
Use the distributive property to multiply x-20 by 9.
y=30x-9x+180
To find the opposite of 9x-180, find the opposite of each term.
y=21x+180
Combine 30x and -9x to get 21x.
21x+180=y
Swap sides so that all variable terms are on the left hand side.
21x=y-180
Subtract 180 from both sides.
\frac{21x}{21}=\frac{y-180}{21}
Divide both sides by 21.
x=\frac{y-180}{21}
Dividing by 21 undoes the multiplication by 21.
x=\frac{y}{21}-\frac{60}{7}
Divide y-180 by 21.
y=30x-\left(9x-180\right)
Use the distributive property to multiply x-20 by 9.
y=30x-9x+180
To find the opposite of 9x-180, find the opposite of each term.
y=21x+180
Combine 30x and -9x to get 21x.
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