What is the value of X

How do i do this using elimination 2x+3y=12 x-y=6

When are two distinct non vertical lines parallel

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3