Question

3) calcule o g (8) na função abaixo

Answer 1

$g(x) = ax + b$

Sabemos pelo gráfico que 

g(0) = 15 e g(4) = 11

$g(0) = a\cdot(0)+b\\b=15\\\\g(4) = a\cdot(4)+b\\4a+b=11\\4a+15=11\\4a=11-15\\\\a= \dfrac{-4}{4} \\\\a=-1\\\\Logo\\\\g(x)=-x+15\\g(8)=-8+15\\g(8)=7$