Solve for y
y=4\left(x-40\right)
Solve for x
x=\frac{y}{4}+40
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40+0.25y=x
Swap sides so that all variable terms are on the left hand side.
0.25y=x-40
Subtract 40 from both sides.
\frac{0.25y}{0.25}=\frac{x-40}{0.25}
Multiply both sides by 4.
y=\frac{x-40}{0.25}
Dividing by 0.25 undoes the multiplication by 0.25.
y=4x-160
Divide x-40 by 0.25 by multiplying x-40 by the reciprocal of 0.25.
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