Question

If y = 5x – 4, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs? (4 points)


{(0, 4), (2, –6), (4, 20)}
{(0, –4), (2, 6), (4, 16)}
{(0, –4), (2, 6), (4, 20)}
{(0, 4), (2, 6), (4, 16)}

Answer 1

@jordanloveangel

Answer 2

A point is (x,y). So when you plug in each x and simplify, you should get the y-value from the same point. If you do, then that's a good input/output pair. If not, then move on to the next answer.
For example, to test the first point: (0, 4) --> 5(0) + 4 = 4, which is what we should get, so this point works. Now you have to try the other two points in that row.

Answer 3

okay... I still dont get it lol sorry

Answer 4

Each coordinate is (x,y). You want plug in the x values {0,2,4} to figure out the corresponding y values.

Answer 5

For example, for x=0:
(x,y)=(x,5x−4)=(0,5(0)−4)=(0,−4)
So one point is (0,−4).

Answer 6

This eliminates all but:
{(0,−4),(2,6),(4,16)}{(0,−4),(2,6),(4,20)}

Answer 7

Okay, first step:
We know that y=5x−4, right? This means wherever there is a y, we can put 5x−4 and it will still be equal. So:
(x,y)=(x,5x−4)
Does this make sense?

Answer 8

yes...

Answer 9

okay glad medal please

Answer 10

so would it be C?

Answer 11

yes...

Answer 12

thanks!

Answer 13

yeah np