Question

Tolong dibantu ya kak :)

Answer 1

F(x) = px + q

f(1) = p + q = 5
f(3) = 3p + q = -1

p+q = 5
3p + q = -1
eliminasi
-2p = 6
p=-3

-3 + q = 5
q = 8

f(-1)= -p + q = 3 + 8 = 11

Answer 2

F(x) = px +q

f(1)=> p + q = 5

f(3)=> 3p+ q = -1
______________ _

-2p = 6

p= -3

p= -3 maka p+ q = 5

q = 8

f(x) = -3x +8

f(-1) = -3 (-1) + 8 = 11