View Full Version : Please help: r varies directly as s and t; r = 29 for....
05-12-2006, 12:09 PM
Find an equation of joint variation. Then solve for the missing value.
r varies directly as s and t. One set of values is r=28, s=7, t=8. Find r when when s=12 and t=9.[/b]
05-12-2006, 12:12 PM
you should try to use this formula r=k*s*t and substitute the numbers into it i hope this helps you :D :D
05-12-2006, 12:27 PM
The formula r=k*s*t will look like this once you plug in the numbers from your problem:28=k*7*8
Hope this helps get you started!!! 8-)
05-12-2006, 12:31 PM
then you multiply both sides by 1/56
then substitute r=1/2st
do you know how to finish it now.
05-12-2006, 03:35 PM
Please review the replies to this almost-identical (http://www.freemathhelp.com/forum/viewtopic.php?t=14529) exercise.
If you get stuck, please reply showing your work. Thank you.
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