X 3 5y 13 July 8, 2019 16 32 64 128 X 3 5y 13 2x y 2 19 X y 3 2x 5y 13 by substitution method X 5y 3 2x 3y 13 X y 3 2x 5y 13 by elimination method 8x 3 xy x 5y 13 0 3 x-5=x+3
