Answer:
[tex]f^{-1}(x) = 4x - 40[/tex]
Step-by-step explanation:
y = ¼x + 10 → x = ¼y + 10
x = ¼y + 10
-10 - 10
_________
[tex]\frac{x - 10}{\frac{1}{4}} = \frac{\frac{1}{4}y}{\frac{1}{4}} \\ \\ f^{-1}(x) = 4x - 40[/tex]
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