1. Nilai x yang memenuhi persamaan x - y = -2 dan x + y = 5 adalah... 2. Nilain y yang memenuhi persamaan 2x + y = 5 dan x + y = 3 adalah... 3. penyelesaiaan da

1.
x - y = -2
x + y = 5
________-
2y = -7
y = -7/2
y = -3.5
x - y = -2
x - (-.35) = -2
x + 3.5 = -2
x = -2 - 3.5
x = -5.5

2.
2x + y = 5
x + y = 3
________-
x = 2
x + y = 3
2 + y = 3
y = 3-2
y = 1

3.
5x - 2y = 4
3x = 4y - 6
_________
5x - 2y = 4 | x2
3x - 4y = -6 | x1
__________
10x - 4y = 8
3x - 4y = -6
__________-
7x = 14
x = 14/7
x = 2
5x - 2y = 4
5(2) - 2y = 4
10 - 2y = 4
-2y = 4 - 10
-2y = -6
y = -6/-2
y = 3
(x,y)
(2,3) B