7. Find the inverse of the function \( f(x)=\frac{1}{5} x-2 \) by switching the roles of \( x \) and \( y \) and solving for \( y \). Then find the inverse of the function \( f \) by using inverse operations in the reverse order. Which method do you prefer? Explain.
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To find the inverse of the function \( f(x)=\frac{1}{5} x-2 \), start by switching \( x \) and \( y \): 1. Rewrite the function as \( y = \frac{1}{5} x - 2 \). 2. Switch the variables: \( x = \frac{1}{5} y - 2 \). 3. Solve for \( y \): \[ x + 2 = \frac{1}{5} y \] \[ y = 5(x + 2) = 5x + 10. \] Thus, \( f^{-1}(x) = 5x + 10 \). Using inverse operations, start with \( y = f(x) \): 1. Add 2 to both sides: \( y + 2 = \frac{1}{5} x \). 2. Multiply by 5: \( 5(y + 2) = x \). 3. Rearranging gives \( 5y + 10 = x \), leading to \( y = \frac{x - 10}{5} \). This confirms our earlier result. The first method feels more direct as it provides a clear algebraic pathway without unnecessary manipulation of the original equation. It can be like switching dance partners—much easier to find the right steps!
