Martin charges $10 for every 5 bags of leaves he rakes. Last weekend, he raked 21 bags of leaves. How much money did he earn?

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)