diketahui f(×)=a×+b jika f(2)=18 dan f(5)=33 tentukan rumus nilai dari rumus fungsi f(×)

f(x) = ax+b

menggunakan cara eliminasi
f(2) = a.2 + b = 18
f(5) = a.5 + b = 33
______________ _
-3a = 15
a = -5

subtitusi nilai a
f(2) = a.2 + b = 18
= -5.2 + b = 18
= -10 +b = 18
= b = 18+10
= b = 28