Question

Tolong bantuin yang no 8 & 10

Answer 1

8)√(x+3) < 2
= x+3 < 4
= x <1
Jawaban (b)

10)
x+y-z = 2
3x-2y+z = 12
2x-3y-3z = 15

3x - 2y + z =12
x +y - z = 2
_______________+
4x - y = 14

2x - 3y - 3z = 15 (x1)
x + y - z = 2        (x3)

2x - 3y - 3z = 15
3x +3y - 3z = 6
_______________-
-x -6y = 9
x +6y = -9

4x - y = 14 (x1)
x + 6y = -9 (x4)

4x-y = 14
4x +24y = -36
_____________-
-25y = 50
y = -2


4x - y = 14
4x - (-2) = 14
4x + 2 = 14
4x = 12
x=3

x + y - z = 2
3 - 2 -z = 2
1-z = 2
-z = 1
z = -1