Question

2x+3y=26 dan 3x+4y=37 adalah x dan y. nilai x-y?

Answer 1

2x+3y = 26 (*3)   6x+9y = 78
3x+4y = 37 (*2)   6x+8y = 74  -
                                y = 4
2x + 3(4) = 26
2x          = 26-12
x           = 14/2
x=7

x-y = 7-4 = 3

Answer 2

2x + 3y = 26 | x3 | 6x + 9y = 78
3x + 4y = 37 | x2 | 6x + 8y = 74
                           ------------------- --
                                     y = 4
2x + 3y = 26
2x + 3(4) = 26
2x + 12 = 26
2x = 26 - 12 = 14
x = 14 : 2
   = 7
x- y = 7 - 4 = 3