berapa nilai 2x + y ? mohon yang tau plisss beritahu

Bab Matriks
Maematika SMA KElas X

2x - y = -2
x + y = -8
-------------- +
3x = -10
x = -10/3

x + y = -8
-10/3 + y = -8
y = -24/3 + 10/3
y = -14/3

2x + y = 2 . (-10/3) + (-14/3)
           = -20/3 - 14/3
           = -34/3
           = -11 1/3

2x - y = -2
....x + y = -8
------------------- +
3x = -10
x = -10/3

x + y = -8
-10/3 + y = -8
y = -8 + 10/3
y = -24/3 + 10/3
y = -14/3

2x + y
= 2(-10/3) + (-14/3)
= -20/3 - 14/3
= -34/3
= -11 1/3