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4 = 3a + b
f(-1) = 6
6 = -1a + b
eliminasikan
3a+ b = 4
-a + b = 6
------------- -
4a = -2
a = -1/2
-a+b = 6
1/2 + b = 6
b = 5 1/2
f(x) = -1/2 x + 5 1/2 kalikan 2
f(x) = -x + 11
tdk ada opsi jawabannya