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a*1+b=7
dikurangi menjadi
2a=4
a=2
a*3+b=11
2*3+b=11
6+b=11
b=11-6
b=5
f(3)=a3+b=11 untuk mencari b f(3)=11. f(3)=a3+b=11
f(1)=a1+b=7 =2.(3)+b=11
__________- =b=11-6=5
a2=4 masukan rumus f(x)=ax+b
a=4:2=2 f(x)=2x+5