Question

z varies jointly with x and y when x=2 and y=2, z=7
write the function that models the relationship

Answer 1

does z=x+y+(someconstant) work?

Answer 2

its supposed to be like indirect and direct variation i have no idea how to even start it

Answer 3

joint variation is direct variation with two or more variables

Answer 4

ok

Answer 5

i still dont get how to start this im so confused :(

Answer 6

z varies directly with x and directly with y

Answer 7

z varies jointly with x and y
...
That means : z = cxy for some constant c

Answer 8

To figure out the constant, plug in those values you have for x,y and z and then solve for c

Answer 9

ok thanks

Answer 10

sure. no problem