Question

The variable z varies jointly with x and y. When x=3 and y=8, z=6. Write an equation that relates x, y, and z?

Answer 1

for example it could be z=x+y-5. But this answer is not unique. May be there is some more conditions in the tsak?...

Answer 2

What's the answer and how do I get it? I'm so confused.

Answer 3

there are lots of equations that satisfy the conditions you've written. z=x+y-5 is one of them

Answer 4

Thank you!