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a)f(4)= 4a+b =-1
f(7)= 7a+b =5
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-3a =-6
a =-6/-3
a =2
4a+b = -1
4(2)+b= -1
8 +b=-1
b=-1-8
b=-9
jdi nilai a =2 dan b=-9
b) f(x)=ax+b
f(x)=(2)x+(-9)
f(x)=2x-9