Question

PLEASE HELP! POINTS!

Given z varies jointly as x and y, use the given values to find an equation that relates x, y, and z.

x = 12, y = 5, and z = 30

A.) z = 0.5xy
B.) z = 12.5xy
C.) z = 2/xy
D. z = 2xy

Answer 1

z=2xy

We know that the function has the form

z

=

k

x

y

, so

k

=

z

x

y

.

If

x

=

7

,

y

=

2

, and

z

=

28

,

k

=

28

7

×

2

=

28

14

=

2

.

So

z

=

2

x

y

If

x

=

6

and

y

=

4

,

z

=

2

×

6

×

4

=

48