Question

1. Penyelesaian dari 6 (5 - x) = 18 adalah ...
a. x = 2 c. x = 6
b. x = 4 d. x = 8
2. Penyelesaian dari 15 - K = 2K + 3 adalah ...
a. K = 1 c. K = 3
b. K = 2 d. K = 4
3. Penyelesaian dari 7 (2m + 1) = 13m - 3 adalah...
a. M = 20 c. M = 10
b. M = -20 d. M = -10
#PAKE CARANYA -.-

Answer 1

1) 6(5-x) = 18
30-6x = 18
-6x = 18-30
-6x = -12
x = 2 (A)

2) 15 - k = 2k +3
15 -3 = 2k+k
12 = 3k
4 = k (D)

3) 7(2m+1) = 13m -3
14m + 7 = 13m -3
14m-13m = -3-7
m = -10 (D)

Answer 2

1.6 ( 5 - x ) = 18
= 30 - 6x    = 18
= -6x          = 18 - 30
= -6x          = -12
= x             = -12/-6
= x             = 2

2. 15 - K = 2K + 3
=  15 - 3 = 2K + K 
= 12        = 3K
= 12 / 3    = K
=  4          = K

3. 7 (2m+1) = 13m - 3
= 14m + 7  = 13m - 3
= 14m - 13m=-3-7
= m             = -10