Question 1029709
Interchange x and y.
Solve for y, it's the inverse.
{{{x=(2y+7)/4}}}
{{{4x=2y+7}}}
{{{2y=4x-7}}}
{{{y=(4x-7)/2}}}
{{{f^(-1)(x)=(4x-7)/2}}}
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*[illustration t1.JPG].