If we use the substitution method to deal with the binary linear equations whose absolute values of the coefficients of two unknowns are not 1, it is the key to solve the application problems of binary linear equations

If we use the substitution method to deal with the binary linear equations whose absolute values of the coefficients of two unknowns are not 1, it is the key to solve the application problems of binary linear equations


1. If 3x + 6y = 15 (1) 2x + 3Y = 8 (2) get 3x + 6y = 15 3x = 15-6y x = 5-2y (3) from (1) substitute (3) into (2) 2 * (5-2y) + 3Y = 8