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f(3) = a(3) +b = 5
= 3a +b = 5
f(1) = a(1) +b = -3
= a +b = -3
3a +b = 5
a +b = -3 -
2a = 8
a = 4
3a +b = 5
3(4) +b = 5
12 +b = 5
b = 5 -12
b = -7
Jadi, nilai a = 4 dan b = -7.
b. Bentuk fungsinya f(x) = 4x +(-7).
f(1) = (1)a + b = -3
(3a + b = 5) - (1a + b = -3) 4(1) + b = -3
2a= 8 4 + b = -3
a = 8:2 b = -3 - 4
a = 4 b = -7
b. f(x) = 4x - 7