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f(3) = p.3 + q
= 3p + q = 8
f(4) = p.4 + q
= 4p + q = 11
3p + q = 8
4p + q = 11 _
-1p = -3
p = -3 : (-1)
p = 3
f(3) =3.3 + q = 8
9q = 8
q = 8-9
q = -1
Rumus.
f(x) = 3.x - 1
2). f(x) = n.x + m
f(7) = n.7 + m
= 7n + m = 16
f(2) = n.2 + m
= 2n + m = 1
7n + m = 16
2n + m = 1 _
5n = 15
n = 3
f(7) = 3.7 + m = 16
21 + m = 16
m = 16-21
m = -5
Rumus.
f(x) = 3.x - 5
3). g(x) = a.x + b
g(5) = a.5 + b
= 5a + b = 8
g(2) = a.2 + b
= 2a + b = -1
5a + b = 8
2a + b = -1 _
3a = 9
a = 3
g(5) = 3.5 + b = 8
= 15 + b = 8
b = 8-15
b = -7
Rumus.
g(x) = 3.x - 7