Question

Which of these ordered pairs is a point on the graph of 4x - y = 15?

a)(-1,-20)
b) (-3, -3)
c) (4, 1)
d) (6, 10)

Answer 1

c) (4,1)

Explanation:

You can simply plug in each ordered pair into the equation to find the correct ordered pair.

Example:

(-1, -20), where -1 is the x coordinate and -20 is the y coordinate.

4x - y = 15

4(-1) - (-20) = 15

-4 - (-20) = 15

16 ≠ 15, so therefore answer "a" is incorrect.

(-3, -3) will give you -9, so that is incorrect.

(6, 10) will give you 14, so that is incorrect.

(4, 1) will give you 15, so that is the correct answer.

4x - y = 15

4(4) - (1) = 15

16 - 1 = 15