Question

Question #b15bf

Answer 1

`y= 240`

Explanation:

The statement "y varies jointly as x and z" is equivalent to saying
y= kxz where the k is a constant. Varies jointly means proportional. For example, if the product of x and z doubles, so will y. To find k, just plug in the given values of y, x, and z.

`25= k(2)(5)`
`25= 10k`
`k= 2.5`

Now that you know k, you can solve for an unknown y when given x and z because k doesn't change numeric value. Plug in the given x and z values.

`y= (2.5)(8)(12)`
`y= 240`