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f(4) = 4a + b = 7
f(2) = 2a + b = 1 -
2a = 6
a = 3
2a + b = 1
2(3) + b = 1
6 + b = 1
b = 1 - 6
b = -5
a + 2b
3 + 2(-5)
3 + -10
3 - 10
-7
pers 1
f(2) = 2a + b
1 = 2a + b
pers 2
f(4) = 4a + b
7 = 4a + b
eliminasikan pers 2 dg pers 1
7 = 4a + b
1 = 2a + b -
6 = 2a
6 : 2 = a
3 = a
cari b
1 = 2a + b
1 = 2 x 3 + b
1 - 6 = 6 - 6 + b
-5 = b
sehingga a = 3, b = -2
maka nilai dari
a + 2b
3 + (2 x -5)
3 + -10
3 - 10
-7 = A