Question

which equation represents the line parallel to the y-axis and 4 units to the left of the y-axis?

Answer 1

Any choices?
4 units left of the Y axis.

Means somewhere over there.

Parallel to the Y- axis means it hovers to the side of the Y-axis.


Like so.

So, if it must be 4 to the left, then we're left with this line.


That line occurs at X=-4.

Your equation is X=-4.