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If 2 varies jointly with x and y, write the variation equation and answer the question in each problem.

1.) If x-2, y=3 and z=4. find z when x =6 and y=2.

2.) If x=5, y= -1 and z=10. find z when x = and y =7.

3.) If x =7, y=3 and z = -14 find y when z = -8 and x=3.

4.) If x=8, y= -3 and z = -6 find x when z =12 and y= -16.​