What do all the points on the y axis have in common?

Answer 1

If the y axis is part of the Cartesian coordinate system, then the other coordinate is zero.
Their x-axis value is 0.

Answer 2

they are equal to 0.

5

l

4

l

3

l <------ as you can see no matter what point the y is, it is always = to 0.

2

l

1

l

0_1_2_3_4_5

Answer 3

The 'x'-coordinate of each one is zero.
the x coordinate is 0

Answer 4

If the y axis is part of the Cartesian coordinate system, then the other coordinate is zero.