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a= 7-2b
4a +3b =18
4 (7-2b) +3b =18
28 -8b +3b =18
-5b = -10
b = 2
a = 7- 2b
a = 7 - 2 (2)
a = 7-4
a=3
maaf jika salah
a + 2b = 7 | x3
=> 8a + 6b = 36
3a + 6b = 21
___________ _
5a = 15
a = 3
a + 2b = 7
3 + 2b = 7
2b = 7 - 3
2b = 4
b = 2