Respuesta :

y = mx+b
m=(y2-y1)/(x2-x1)
m=(7-0)/(3-8)=-7/5=-14/10=-1.4
y = (-7/5)x+b    , take point (8,0) and substitute
0 = (-7/5)8+b
b=56/5=112/10=11.2 -y  intercept
y=-1.4x+11.2