Question

The table below shows the values of y for different values of x:

x y
0 0
1 3
2 6
3 9



Which equation shows the relationship between x and y?
y = 3x
x = 3y
y = 3 + x
x = 3 + y

Answer 1

Even if you can't tell right away that "y = 3x" is the correct choice, you can try a couple of the ordered pairs and see what fits.

(0, 0) will only satisfy the first two equations.
(1, 3) fails to satisfy the second equation, leaving only the first equation as a viable choice.