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f(5)=a(5)+b -2a+b=-8 5a+b=13
13=5a+b __________- 5(3)+b=13
7a = 22 15 +b=13
f(x)=ax+b a=7 b=13-15
f(-2)=a(-2)+b a=3 =-2
-8=-2a+b
rumus fungsi
f(x)=ax+b
f(x)=3x+-2