Question #b15bf

1 Answer
Nile River
Feb 12, 2016

#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#

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