Okay, let's use x for the 24 page packages and y for the 30 page packages: x + y = 9 x = -y + 9 Now here's the second equation: 24x+30y = 258 We can input y into our second equation: 24(-y + 9) + 30y = 258 -24y + 216 + 30y = 258 6y = 42 y = 7 9 - 7 = 2, so: Joann bought 7 :30 paper pakages and 2 :24 paper packages
