SOLUTION: if y varies jointly as x and z, by what percent will y change when x is increased by 15% and z is decreased by 4%

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Question 1102410: if y varies jointly as x and z, by what percent will y change when x is increased by 15% and z is decreased by 4%
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
y=x*z
y=1.15x*0.96z; multiplication is commutative and associative, so the constants may be directly multiplied. When x is increased by 15%, it becomes 1.15 x. When z is decreased by 4%, it becomes 0.96 z, y=1.104 xz
y will increase 10.4%