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b=2a+14 b=2(-3)+14=8
f(3)=-1; -1=b+3a;
-1=2a+14+3a
-15=5a
-3=a.
3a+b=-1
_________ -
-5a =15
a = -3
-2×(-3)+b=14
6+b=14
b=14-6
b=8
f(7)= -3×7+8
= -13
2. P={a,b,c,d} n(P)=4
Q={2,3,5} n(Q)=3
banyaknya pemetaan dari P ke Q= 81