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December 21, 2014

December 21, 2014

Posted by **nmdna** on Saturday, September 15, 2012 at 9:59am.

- algebra -
**Reiny**, Saturday, September 15, 2012 at 11:49amy varies directly with x ----> y = kx , where k is a constant

20 = k(50

k = 2/5

y = (2/5)x

when y = 36

36 = (2/5)x

2x = 180

x = 90

or ... use a proportion

x/50 = 36/20

x = 50(36)/20 = 90

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