Question

Diketahui f (x ) = px+q ,f (- 1 ) = -5 ,dan f (4) = 5 nilai f (-6 ) adalh
a . - 15
b . -9
c . 7
d 10

Answer 1

Dik : f(x) = px + q

Jawab :
F(4) = p(4)+q
5= 4p + q

F(-1)= p(-1)+q
-5 = -1p + q


-5 = -1p+q
5 = 4p+ q
__________ -
-10 = -5p
2 = p


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


F(-6) = 2(-6)+(-3)
=-15

Answer 2

F(-1) = p.-1+q= -5
         -p +q = -5
f (4)= p.4+q= 5
         4p+q= 5

4p+q= 5
-p+q=-5
5p  = 10
p= 10/5 = 2

mncri q =  -p+q= -5
               -2 +q= -5
                   q= -5+2 =-3

f(-6)= px+q
         2.-6-3
         -12-3 = -9

maaf klo slah