Question

Diberikan fungsi f(x) = ax + b. Jika f(-2) = -8 dan f(5) = 13, maka nilai a dan b adalah...

Answer 1

F(x) = ax + b
f(-2) = (-2)a + b = (-8)
f(5) = 5a + b = 13
________________ -
⇔ (-7)a = (-21)
⇔ a = 
⇔ a = 3

Di substitusi kan nilai a = 3, maka tentukan nilai b, diperoleh
5a + b = 13
5(3) + b = 13
15 + b = 13
b = 13 - 15
b = (-2)

Jadi nilai a = 3 dan nilai b = (-2)