SOLUTION: f(x) = 7x + 4, find a formula for f^-1(x) f^-1(x)=

SOLUTION: f(x) = 7x + 4, find a formula for f^-1(x) f^-1(x)=

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Question 725031: f(x) = 7x + 4, find a formula for f^-1(x)
f^-1(x)=
Answer by josgarithmetic(39613) (Show Source): You can put this solution on YOUR website!
The fast way to find the inverse is like this:
,
Switch x and y positions,
,
Solve for y,

, meaning

That was not very formal but for linear equations of lines is effective enough.
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