3ab+4c=72ab jika a =6-4c maka c =
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the answer is 5 I think chooooo yet
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We want to make c the subject of the equation.
We do it as follows.
3ab + 4c = 72ab....1
a = 6 - 4c................2
From 1 :
4c = 72ab - 3ab
4c = 69ab
c = 69/4ab
From 2:
4c = 6 - a
c = (6 -a)/4
equating the two:
(6 -a )/4 = 69/4ab
Multiply through by 4 we have :
6 - a = 69ab
69ab + a = 6
a(69b -1) = 6
a = 6/(69b -1)
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