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)}

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)}

anonymous · Answer

@Luigi0210

anonymous · Answer

@wio

anonymous · Answer

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

anonymous · Answer

ok..

anonymous · Answer

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

anonymous · Answer

oh! wait..... i dont get it....

anonymous · Answer

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

anonymous · Answer

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?

anonymous · Answer

okay
so it would be the 2nd one?

anonymous · Answer

right?!

anonymous · Answer

Do you mean $$
\{(0,-4),(2,6),(4,16)\}
$$?

anonymous · Answer

yes

anonymous · Answer

is that right?!

anonymous · Answer

Yes, it is correct.