Diketahui 3x+y=-2 -2x+3y=5 Nilai x-y adalah...

3x + y = - 2
- 2x + 3y = 5

3x + y = - 2
y = - 2 - 3x

- 2x + 3y = 5
- 2x + 3(- 2 - 3x) = 5
- 2x - 6 - 9x = 5
- 11x = 5 + 6
- 11x = 11
x = - 1

y = - 2 - 3x
y = - 2 + 3
y = 1

x - y
= 1 + 1
= 2

Maaf Kalau Salah

3x + y = -2 { × 3 }
-2x + 3y = 5 { × 1 }

9x + 3y = -6
-2x + 3y = 5
___________ -
7x = -1
x = -1/7

3x = -3/7
3x + y = -2
-3/7 + y = -2
y = -2 - 3/7
y = -7/7 - 3/7
y = -4/7

x - y
= -1/7 - ( - 4/7 )
= -1/7 + 4/7
= 3/7
semoga bermanfaat