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Verified answer
FungsiF(x) = ax + b
F(-1) = -a + b = 2 .......... (1)
F(2) = 2a + b = 11 ......... (2)
Dari persamaan poin (1) dan (2)
-a + b = 2
2a + b = 11
—————— –
-3a = -9
a = -9/-3
a = 3
Substitusikan ke persamaan (1)
-a + b = 2
-3 + b = 2
b = 2 + 3
b = 5
F(x) = ax + b
F(x) = 3x + 5