penyelesaian system persamaan antara 2x + 4y + 2=0 dan 3x - y -11=0, adalah x1 dan y1.nilai x1 + y1 adalah...

2x + 4y = -2
12x - 4y = 44
----------------- +
14x = 42
x = 42/14
x = 3

2x + 4y = -2
2.3 + 4y = -2
6 + 4y = -2
4y = -2-6
4y = -8
y = -8/4
y = -2

x + y = 3 - 2 = 1

2x + 4y + 2 = 0. x 3
3x _ y _ 11 = 0" x 2

6x + 12y + 6 = 0
6x _ 2y _ 22 = 0
______________ _
14y + 28 = 0
14y = 0 _ 28
y = _ 28/14
y = _ 2

2x + 4y + 2 = 0
2x + (4 x _ 2 ) + 2 = 0
2x + _ 8 + 2 = 0
2x = 0 + 8 _ 2
2x = 6
x = 6/2
x = 3

dit : x+y
3 + _ 2 = 1