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a+b = 5
f(-3)=11
-3a+b=11
eliminasi a+b=5 dan -3a+b=11
akan didapat hasil a = -3/2 dan b = 13/2
f(1) = 5
a(1) + b = 5
a + b = 5
f(-3) = 11
a(-3) + b = 11
-3a + b = 11
a + b = 5 l x-3 l
-3a + b = 11 l x1l
-3a - 3b = -15
-3a + b = 11
-------------------- -
-4b = -26
b = 26/4
b = 6,5
a + b = 5
a + 6,5 = 5
a = 5 - 6,5
a = - 1,5