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|-8 1| |6 5 | | -2 6 |
RS = -8 6a-12b
2 14a-18b
jelas sama
6a-12b=-6 14a-18b=6
a-2b=-1 7a-9b=3
kali 7 persamaaan 1
7a-14b = -7
7a-9b = 3 _
23b = -10
b= - 10/23
a=1+2b
a=1 - 20/23
a=3/23
a+b=3/23 - 10/23 = -7/23
6a - 12b = - 6
----------------- : 6
a -2b = -1
----------------- x 14
14a - 28b = - 14
14a - 18b = 6
-------------------- (-)
-10b = -20
b = -20/-10 = 2
substitusi,
a - 2b = -1
a - 2(2) = -1
a = 4 - 1 = 3
maka a+b = 3 + 2 = 5