A6-pack of undershirts costs 13.98.this is 3.96 less than the cost of buying 6 individual shirts. if each undershirt costs the same amount, how much does each undershirt cost when purchased individually?

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)