Question

. If y – 3 = 3x, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs?
A {(0, 3), (1, 6), (2, 9)}
B {(3, 0), (6, 1), (9, 2)}
C {(1, 3), (2, 6), (3, 9)}
D {(3, 1), (6, 2), (9, 3)

Answer 1

y - 3 = 3x is equivalent to y = 3x + 3.
Let's plug in values of x, and check which of the ordered pairs represent the function.
Example:
if x=0, y=3*0+3=3
so the ordered pair (0,3) checks.

Answer 2

how do we do it?

Answer 3

Just like I did with the ordered pair (0,3).
Ordered pairs are written in the form of (x,y)
What we do is we take the value of x and we plug it in the equation of y = 3x + 3.
If the value of y that we find is equal to the one given, then the ordered pair represents the function.

Answer 4

All the pairs from a set must check so that we can say the set represents the function.