Question

If point (4, 5) is on the graph of a function, which equation must be true?

f(5)=4
f(5,4)=9
f(4)=5
f(5,4)=1

Answer 1

f(4) = 5

Explanation:

Think about it this way

a point with an x value of 4,

this x value is put into the function,

then the function outputted a y value (or value) of 5.

So, we can name this function f(x)

Then, we let x = 4,

then the output for f(4) = 5

Answer 2

Answer: f(4) = 5

Explanation:

If the point (4, 5) is on the graph of a function, this means that when you input 4 you get an output of 5.

Inputs are usually shown with the x-coordinate, and outputs are usually shown with the y-coordinate.

This means that (4, 5) is an input of 4 for an output of 5.