Question

Seja a funçao f(x)=ax+b. Se f(-1)=3 e f(2)=0 entao a+b vale

Answer 1

f (-1)= a (-1)+b
3=-a+b
b= 3 +a

f (2) = a2 + b
a2 + b= 0
b = -2a

b=b
3+a= -2
a igual a 1
b igual a -2

a+b= -1