Think of the points on X-Y plane.

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

Can we put the given value of solution into the equation to get the value of b?

Can we put the given value of solution into the equation to get the value of a?

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

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

Put the value of x (2 to 4) and find the value of y.

check whether the given point lies on the line or not.

Can we put the value of x as 2,3 and 4 respectively in the equation to solve for y?

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

Use your knowledge of coordinate points lying on the line .