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May I pretty please have some math help?

May I pretty please have some math help?-example-1
User Sivajith
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1 Answer

5 votes
Answer: A.
The point on the graph of f⁻¹ (x) is (-5,4)

Step-by-step explanation
Let f(x) = -(5/4)x.
This function passes through (4, -5) as specified, because
f(4) = -(4/5)*(4) = -5

Construct f⁻¹ (x) as follows:
Set y = f(x).
y = -(4/5)x
Switch x and y.
x = -(4/5)y
Solve for y
y = -(5/4)x
Set f⁻¹ (x) to y.
f⁻¹ (x) = - (4/5)x.

Test x=-5 to see if y=4.
f⁻¹ (-5) = -(4/5)*(-5) = 4 Correct!

User Manuel Lopera
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