Question

4 de la eso , matemáticas A

Answer 1

Si las magnitudes x e y son inversamente proporcionales se cumple que x*y=k.   

   x          y             x*y=k

   2         40          2*40 = 80 
           -320                                  x*(-320)=80  → x = -80/320 = -1/4
   5          16         5*16 = 80
  -8                                                   (-8)*y=80 →  y = -80/8 = -10
             -8                                        x*(-8)=80 →  x = -80/8 = -10
 -20                                                (-20)*y=80 →  y = -80/20=-4