Question

F(x) = ax + b. Jika f(3) = -5 dan f(1) = 15, nilai f(2) + f(6) adalah

Answer 1

F(3)=-5--->3a+b = -5
f(1)=15--->a+b =15
eliminasi
2a = -20
a = -10
b=15 -a=15- (-10)=25

f(2)+f(6)=2a+b+6a+b=8a+2b = -80+50= -30