2e + 3m = 10.....multiply by -2 4e + 2m = 12 ---------------- -4e - 6m = -20 (result of multiplying by -2) 4e + 2m = 12 ------------------add -4m = -8 m = -8/-4 m = 2....so muffins cost $ 2 a piece <===
4e + 2m = 12 4e + 2(2) = 12 4e + 4 = 12 4e = 12 - 4 4e = 8 e = 8/4 e = 2......so expresso's cost $ 2 a piece <===
