Question

Which of the following values would complete the ordered pair if the point is on the graph of f (x) = -3x + 2 ?
(-1, ___)

Answer 1

just by plugging in the x which is -1 in this case

-3(-1) +2 = 5

I believe that is correct

Answer 2

Answer: the y-coordinate that completes the point is 5.

Explanation:

An ordered pair (x, y) indicates the x-and-y coordinates of a general point, where x is the input value of a function and y is the output value.

The output value is y = f(x) and must be found applying the rule (function) to the given input value.

In this case the rulte is f(x) = - 3x + 2, and the input value, x,  is - 1 (the first value of the ordered pair).

This is the mathematical procedure:

• x = - 1
• f(x) = f (-1) = -3 (-1) + 2 = 3 + 2 = 5.