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5a + 3b = 26 [pers.2]
pers. 1 dikali 3,pers.2 dikali 7
6a - 21b = 105
35a +21b = 182
-------------------- +
41a = 287
a= 7
masukkan a ke pers.1
2(7)-7b = 35
14-7b = 35
-7b = 35-14
-7b = 21
b = -3
Nilai 4ab = 4 x 7 x -3
= 28 x -3
= -84 (B)
#SemogaMembantu
2a - 7b = 35 |x5| 10a - 35b = 175
5a + 3b = 26 |x2| 10a + 6b = 52 -
-41b = 123
b = -3
2a - 7b = 35
2a - 7(-3) = 35
2a + 21 = 35
2a = 14
a = 7
nilai 4ab = 4 7 -3 = -84 (B)