Question

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

Answer 1

2x+3y= 26
3x+4y=37 

(di eleminasikan)
6x+9y= 78
6x+8y=74 -
      y=4

2x+3y=26
2x+3(4)= 26
2x+12=26
2x=26-12
2x=14
x=14/2
x=7

x-y= 7-4=3

Answer 2

2x + 3y = 26 ----->  6x + 9y = 78
3x + 4y = 37 ------> 6x + 8y = 74
--------------------------------> 1y = 4
y = 4,, masukkan pada salah satu persamaan
2x + 3y = 26
2x + 3.4 = 26
2x + 12 = 26
2x = 26 - 12
2x = 14
x = 14/2
x = 7

maka x-y = 7 - 4 = 3