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4a+b = -3
ganti x dengan -2
-2a+b= 9
cari persamaan
6a = -12 a = -2 cari b = 4 + b = 9 , b = 5
-12 + 5 = -7
-3 =4a+b (1)
f(-2)=9
9 =-2a+b (2)
jadi
-2a+b=9
4a+b=-3 -
-6a=12
a=12
-6
a=-2
-2a+b=9
-2.-2+b=9
4b=9
b=9-4
b=5
Jadi f(6)=ax+b
=-2.6+5
=-12+5
=-7