The value of Y varies jointly with the value of X and Z when X equals five and Z equals 10 the value of Y is 600 what is the value of Y when X equals four & Z equals nine

Answer 1

y= kxz

600=k(5)(10)

k = 600/50 = 60/5 = 12

y =12xzy

=12(4)(9)

y = 48(9)

y = 432 when x=4 and z= 9