Solve for x
x=\frac{2y-115}{7}
Solve for y
y=\frac{7x+115}{2}
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3.5x+57.5=y
Swap sides so that all variable terms are on the left hand side.
3.5x=y-57.5
Subtract 57.5 from both sides.
\frac{3.5x}{3.5}=\frac{y-57.5}{3.5}
Divide both sides of the equation by 3.5, which is the same as multiplying both sides by the reciprocal of the fraction.
x=\frac{y-57.5}{3.5}
Dividing by 3.5 undoes the multiplication by 3.5.
x=\frac{2y-115}{7}
Divide y-57.5 by 3.5 by multiplying y-57.5 by the reciprocal of 3.5.
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