x - ounces of an oil blend, y - ounces of glycerin; 1.5 · x + 1 · y = 5.50 x + y = 4 ---------------------- 1.5 x + y = 5.5 x + y = 4 / · ( -1 ) ---------------------- 1.5 x + y = 5.5 + - x - y = - 4 --------------------- 0.5 x = 1.5 x = 1.5 : 0.5 x = 3 3 + y = 4 y = 1 There are 3 ounces of an oil blend and 1 ounce of glycerin in 4 ounces of lotion.
