Hi

Suppose p varies jointly as r and t. If p = 1 when r = -5 and t = 2

   p = krt where k is th econstant of proportionality

   1 = k*-5*2

  1/-10 = k = -.1    | p = -.1rt

find t when p = 6 and r = 12.

  p = -.1rt

  p/-.1r = t

  t = p/-.1r  

  t = 6/(-.1*12) = 6/-1.2 = -5       when p = 6 and r = 12

   

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