a. |2x – 1| = 3x b. |6 – 7x| = 2
Tentukan nilai x yang memenuhi setiap persamaan berikut.
a. |2x – 1| = 3x
b. |6 – 7x| = 2
Pembahasan:
a. |2x – 1| = 3x
* 2x1 – 1 = 3x1
3x1 – 2x1 = -1
x1 = -1
* 2x2 – 1 = -3x2
3x2 + 2x2 = 1
5x2 = 1
x2 = 1/5
Hp {-1, 1/5}
b. |6 – 7x| = 2
* 6 – 7x1 = 2
7x1 = 6 – 2
x1 = 4/7
* 6 – 7x2 = -2
7x2 = 6 + 2
x2 = 8/7
Hp {4/7, 8/7}
a. |2x – 1| = 3x
b. |6 – 7x| = 2
Pembahasan:
a. |2x – 1| = 3x
* 2x1 – 1 = 3x1
3x1 – 2x1 = -1
x1 = -1
* 2x2 – 1 = -3x2
3x2 + 2x2 = 1
5x2 = 1
x2 = 1/5
Hp {-1, 1/5}
b. |6 – 7x| = 2
* 6 – 7x1 = 2
7x1 = 6 – 2
x1 = 4/7
* 6 – 7x2 = -2
7x2 = 6 + 2
x2 = 8/7
Hp {4/7, 8/7}
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