Can we try to write whats exactly happening in the statements.

The point will lie on the y-axis if the x coordinate is 0.

The graph of this equation will be parallel to the x - axis.

Can we put the value of the solution into the equation to solve for q?

If a point lies on Y-axis then its X-cordinate will be how much ?

Can we recall the concept of intercept?

An x intercept is a point in the equation where the y value is 0.

Can we put the value of the solution into the equation to solve for p?