Jawabanmu

2014-05-02T18:51:12+07:00
2014-05-02T18:53:19+07:00
2a + b = 0
1a + b =-2
___________ _
1a       = 2
a = 2

b=
2.2 + b = 0
4 + b = 0
b = 0-4
b= -4

Jadi,
2.4 + (-4) 
= 8 + (-4)
= 4
semoa membantu :)