Question

Os pontos (0,8),(3,1) e (1,y) do plano cartesiano. Qual valor de y

Answer 1

(0,8),(3,1) e (1,y)

y=ax+b
{8=a.0+b⇒ b=8
{1=a.3+b⇒3a+8=1⇒3a=1-8=-7 ⇒a=-7/3

y=-7x/3+8
y=-7.1/3+8
y=-7/3+8
y=(-7+24)/3=17/3              ⇒(1,17/3)