7 5x-9 4y-3 5x 4 4y July 8, 2019 16 32 64 128 7 5x-9 4y-3 5x+4 4y 5 x 7 = 35 6xy - 4y + 6 - 9x 7x-4y=11 5 9x+5y=-5 5