Question 567928
  Y varies as x
 y=kx ( where k is the constant )
 then we subtitute for the values of y and x to know the value of our constant.
 12=-6k, divide both sides by the co-efficient of k
 therefore k=-2
   (y=-2x) :the law of variation.
  Hence find y when x=-4
 y=-2x
 y=-2(-4)
 y=8