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f(6) = 6a + b = 20
f(9) = 9a + b = 29
___________-
-3a = -9 → a = -9/-3 = 3
Masukin nilai a=3 ke salah satu persamaan (saya ambil yg 6a+b = 20)
6a+b =20
6.3 + b = 20
18 + b = 20
b = 2
Jadi a=3, b=2 dan rumus f(x) = 3x+2
I did my best
f(6) = a6 + b
20 = 6a + b
29 = 9a + b _
_________
-9 = -3a
a = 3
20 = 6a + b
20 = 6 .3 + b
20 = 18 +b
b = 20 -18
b = 2
klo gk slah ya