2x 3y = 13 4x 5y = 23 July 8, 2019 16 32 64 128 2x 3y 13 4x 5y 23 by substitution method 2x 3y 13 4x 5y 23 by elimination method 2x 3y 13 4x 5y 23 by graphical method 2x 3y 13 4x 5y 23 by substitution method answer