What it 2×10 my homework too hard

43lbs of tomatos cost $387. how much would 41lbs cost

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

Can someone me out here and the tell me the greatest common factor