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a. f(1) = a(1) + b
3 = a + b ..... (1)
b. f(2) = a(2) + b
5 = 2a + b ..... (2)
eliminasi kedua persamaan hingga di dapat
a = 2, dan b = 1
maka f(x) = 2x + 1
f(1)⇒1a+b=3
f(2)⇒2a+b=5 _ apabila ada jwaban yg kurang tepat mohon maaf yh...!!!!!!!!!
⇒-a = -2
⇒ a = 2
a+b=3
2+b=3
b=3-2=1
b=1