Question

Which points are on the graph of the function rule f(x) = 10 – 4x?

Answer 1

Are you given a list of choices?

Answer 2

18, –2), (10, 0), (2, 2)
(–18, 2), (–10, 0), (–2, –2)
(–2, 18), (0, 10), (2, 2)
(2, –18), (0, –10), (–2, –2)

Answer 3

f(x) = 10 – 4x is the same as y = 10 - 4x

Answer 4

Let's check and see if the point (-2,-2) is on the graph of y = 10 - 4x

y = 10 - 4x

y = 10 - 4(-2) .. plug in x = -2

-2 = 10 - 4(-2) ... plug in y = -2

-2 = 10 + 8

-2 = 18 ... this is false so (-2,-2) is NOT on y = 10 - 4x

Answer 5

Do you see how I worked that out?