Soal 1 Diketahui f(x) = px + q, f(–1) = –5, dan f(4) = 5. Nilai f(–6) adalah …. A. –15 B. –9 C. 7 D. 10 Soal 2 Diketahui f(x) = px + q, f(–2) = –13, dan f(3) =

1. f(x) = px+q
f(-1)=-5
f(4)=5
-1p+q=-5
4p+q=5
------------ ---
-5p=-10
p=2.

4(2)+q= 5
8+q=5
q=-3.

f(-6)
2(-6)+(-3)
-12+-3
= (-15) A.

2.f(x)=px+q
f(-2)=-13
f(3)=12

-2p+q=(-13)
3p+q=12
------------ ---
-5p=(-25)
p=5.

3(5)+q=12
15+q=12
q=(-3).

f(5)
5(5)+(-3)
25-3
= 22. D.

3. f(x) = ax+b
f(-5)=15
f(5)=(-5)

-5a+b=15
5a+b=(-5)
----------- ---
(-10)a=20
a=-2.

5(-2)+b=(-5)
(-10)+b=(-5)
b=5.

f(1)
(-2)1+5
-2+5
=3. C.

cmiiw.