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3a-1=20
3a=20+1
3a=21
a=21/3=7
2. f(x)=7x-1
f(x)=ax-1
f(3)=3a-1
20=3a-1
20+1=3a
21=3a
a=21/3
a=7
Untuk rumus fungsi, subtitusikan nilai a
f(x)=ax-1
f(x)=7x-1 <-----rumus fungsi