Question

1. 2x-y=4
2. 5 - 5 x >,5
3. 2x+6=4-x
4. 4-x2=x+2

Yang tau jawab yah...
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Answer 1

1. 2x - y = 4
2x = 4 + y
X = (4 + y)/2

2. 5 - 5x > 5
5 - 5 > 5x
0 > 5x
0 > x
Hp : {x| X < 0}

3. 2x + 6 = 4 - x
2x + x = 4 - 6
3x = -2
X = -2/3

4) 4 - x² = x + 2
X² + x + 2 - 4 = 0
X² + x - 2 = 0
(X + 2) (x - 1) = 0
X = -2
X = 1