Pls pls pls I need help with this

15 points ! ~ see if you know the answer to both you!

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

What is the value of x when x + 7 = 21?