3x 5y 4 9x 2y 7 by substitution method July 8, 2019 16 32 64 128 3x 5y 4 9x 2y 7 by substitution method answer 3x 5y 4 0 और 9x 2y 7 by substitution method 3x 5y 4 0 and 9x 2y 7 by substitution method in hindi Solve 3x 5y 4 and 9x 2y 7 by substitution method 3x 5y 4 0 and 9x 2y 7 by elimination and substitution method
