Hi

If y varies jointly as x and z and y = 12 when x = 2 and z = 3,

   y = kxz where k is th econstant of proportionality

  12 = k*2*3

  12/6 = k = 2

find y when x = - 3 and z = 0.5.

    y = 2xz

    y = 2*-3*.5 = -3 when x = -3 and z = .5 of 1/2 

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