Pearson Algebra 2 Common Core, 2011
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Pearson Algebra 2 Common Core, 2011 View details
6. Natural Logarithms
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Exercise 78 Page 483

To determine the inverse of the given function, switch x and y and solve for y.

Inverse: y=x-7/5
Result: Yes, the inverse is a function.

Practice makes perfect
We want to find the inverse of the given function. To do so, we need to switch x and y and solve for y. y=5 x+7 → x=5 y+7The resulting equation will be the inverse of the given function.
x=5y+7
â–Ľ
Solve for y
x-7=5y
x-7/5=y
y=x-7/5
Now that we found the inverse of the given function, we can determine whether the inverse is a function. We need to recall that function is a relation where each input is related to exactly one output. In our case, we can see that for each x, there is exactly one value of y. If x=a, then y=a-7/5. Therefore, the inverse is a function.