P(2.6.10) Q(21.45.69) Rumus fungsi dari P ke Q adalah…

~Jawab~

f(2) = 2a + b = 21
f(6) = 6a + b = 45
f(10) = 10a + b = 69

eliminasi pers (1) dan (2)

6a + b = 45
2a + b = 21
__________(-)
4a = 24
a = 6

substisukan a

10a + b = 69
10(6) + b = 69
60 + b = 69
b = 69 – 60
b = 9

f(x) = ax + b
f(x) = 6x + 9