Jawapan

2016-05-09T18:57:26+08:00
4a + 2b = -4
a + b = -4
4(-b - 4) + 2b = -4
-4b -16 + 2b = -4
-2b = 12
b = -6
a = 6 - 4
a = 2
2 5 2