Jointly function

If z varies jointly as x and y, and z = 12 and x = 2 and y = 4, find z when x = 5 and y = 2

Correct answer:

z2 =  15

Step-by-step explanation:

z=12 x=2 y=4  z=k x y  k=x yz=2 412=23=121=1.5  x2=5 y2=2  z2=k x2 y2=1.5 5 2=15

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