Tentukan penyelesaian dari pertidak samaan 2 variabel berikut!
a. 2x + 4 < 0
b. 4x - 12 > 0
c. 4x + 1 < 2x - 11
d. 6 - 4 x >= 2x ![]()
a. 2x + 4 < 0
b. 4x - 12 > 0
c. 4x + 1 < 2x - 11
d. 6 - 4 x >= 2x
Jawaban :
Tentukan penyelesaian dari pertidaksamaan 2 variabel berikut!
a. 2x + 4 < 0
b. 4x - 12 > 0
c. 4x + 1 < 2x - 11
d. 6 - 4x ≥ 2x
— — — — — — — — —
a. 2x + 4 < 0
=> 2x < 0 - 4
=> 2x < -4
=> x < -4/2
=> x < -2
— — — — — — — — —
b. 4x - 12 > 0
=> 4x > 0 + 12
=> 4x > 12
=> x > 12/4
=> x > 3
— — — — — — — — —
c. 4x + 1 < 2x - 11
=> 4x - 2x < -11 - 1
=> 2x < -12
=> x < -12/2
=> x < -6
— — — — — — — — —
d. 6 - 4x ≥ 2x
=> 6 ≥ 2x + 4x
=> 6 ≥ 6x
=> 6/6 ≥ x
=> 1 ≥ x
=> x ≤ 1
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