Question

Tentukan himpunan penyelesaian berikut
1. 4 (3 - 2y) = 15 - 7y

Answer 1

4(3-2y) = 15-7y
12-8y = 15-7y
-8y+7y = 15-12
-y = 3
y = -3

maaf kalau slah :)

Answer 2

4 (3 - 2y) = 15 - 7y
= 12 - 8y = 15 - 7y
= 12 - 8y -12 = 15 - 7y -12 (kedua ruas -12)
= -8y = 3 - 7y
= -8y - 7y = 3 - 7y -7y (kedua ruas -7y)
= -15y = 3
= 15y = -3
= 15y : 15 = -3 : 15 (kedua ruas : 15)
y = -0, 2