Page 46 - E-Modul Persamaan dan Pertidaksamaan Linear Satu Variabel

KUNCI JAWABAN

Latihan soal 1

3
1. a. 12x + 10 =− 4 − 2x 2.c 15 − = 6
4
12x + 2x =− 4 − 10
15 3 6
4y − = 4y ×
14x =− 14 4 y y
x =−1 15y − 12 = 24

15 = 24 + 12
36
y =
15
12 2 1
1. b. x + 3 = 2. d 6 − 9 = 4 − 8
5 3 2
5(x + 3) = 12 4x − 6 = 2x − 4

5x + 15 = 12 4x − 2x =− 4 + 6
5x = 12 − 15 2x = 2

3 2
x = x =
5 2
x = 1

2. a. 2 3x − 7 = 6 − 4x 1 5
3. − = +
2 3 3 6
6x − 14 = 6 − 4x
x 1 x 5
6 − = 6 +
6x + 4x = 6 + 14 2 3 3 6
10x = 20 6 6 6 30
− = +
2 3 3 6
x = 2
2(6 ) 2 × 2(6 ) 30
− = +
3(2) 2 × 3 2(3) 6
1
2. b. − 13 = + 5
4 3x − 2 = 2x + 5
1 3x − 2 − 2x = 2x − 2x + 5
4 x − 13 = 4 x + 5
4
x − 2 = 5
4x − 52 = x + 20
x = 5 + 2
4x − x = 20 + 52
x = 7
3x = 72

x = 24

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