2x-y=-10 3x+y=-11 ada yg tau?tolong donk minta jawaban nya!!

Kelas 8 Matematika
Bab SPLDV

3x + y = -11
2x - y = -10
----------------- + 
5x = -21
x = -21/5

2x - y = -10
2x - (-21/5) = -10
2x + 21/5 = -10
2x = -50/5 - 21/5
x = -71/5 : 2
x = -71/10

(-71/10, -21,5)

2x -y = -10
3x +y= -11
---------------- +
5x = -21
x = -21 : 5 = -4,2

y = 2x -y = -10
= 2x-4,2 -y = -10
= -8,4 -y = -10
= -y = -10 : -8,4 = 1,19 = 1,2 (bulatkan)