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Yg nomor 21 aku kurang ngertiVerified answer
No.6|x - 7| = 3
x - 7 = 3
x = 10
x - 7 = -3
x = 4
nilai x yang memenuhi x=4 atau x=10
HP : {4,10}
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|x - 2| ≤ 3
-3 ≤ x - 2 ≤ 3
-3 + 2 ≤ x ≤ 3 + 2
-1 ≤ x ≤ 5
nilai x yang memenuhi adalah -1 ≤ x ≤ 5
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|x - 5| ≥ 1
(i)
x - 5 ≥ 1
x ≥ 1 + 5
x ≥ 6
(ii)
x - 5 ≤ -1
x ≤ -1 + 5
x ≤ 4
nilai x yang memenuhi adalah x ≤ 4 atau x ≥ 6
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No. 7
2x + 4y = -6 |×1| 2x + 4y = -6
3x - 2y = 7 |×2| 6x - 4y = 14
---------------------- (+)
8x = 8
x = 1
3x - 2y = 7
3(1) - 2y = 7
2y = 3 - 7
2y = -4
y = -2
jadi HP = {(1,-2)}
No. 8
3x + 4y = 14 |×2| 6x + 8y = 28
2x - 5y = -6 |×3| 6x - 15y = -18
------------------------- (-)
23y = 46
y = 2
2x - 5y = -6
2x - 5(2) = -6
2x = -6 + 10
2x = 4
x = 2
jadi 10x - 4y
= 10(2) - 4(2)
= 20 - 8
= 12