Answer:
f(-4) = -28
f(5) = 35
Explanation:
"Evaluate f(x) at the given values of x." just means that they are going to give us a number to fill in for x. And then we get a number answer.
So, f(x) = 7x is like a rule. Like calculation directions. It means, whatever x is, times that by 7.
If x = -4, then we fill it in.
f(-4) = 7 • -4 and do the multiplying, and get:
f(-4) = -28
^^^that means when x is -4, f(x) is -28.
(and f(x) is just fancy math for y)
If x = 5, then we fill it in.
f(5) = 7 • 5 and do the multiplying, and get:
f(5) = 35
Here, x is 5 and f(x) is 35, or y is 35 *remember y = f(x)*