Question

Diberikan f(x)=ax+b dengan f(3)=4 dan f(1)=-1 maka f(-2)=⋯
a. -3/2
b. -5/2
c -7/2
d. -17/2

Answer 1

Verified answer

F(x) = ax+b

f(3) = a(3) + b
4 = 3a + b

f(1) = a(1) + b
-1 = a + b

Maka
3a + b = 4
a + b = -1
dikurangkan sehingga
2a + 0 = 5
2a = 5
a = 5/2

untuk b
a + b = -1
5/2 + b = -1
b = -1-5/2
b = -7/2

Maka
f(-2) = a(-2) + b
f(-2) = 5/2 (-2) + (-7/2)
f(-2) = -5 - 7/2
f(-2) = -17/2

Jawaban D