Posted by **chris** on Wednesday, September 19, 2012 at 12:10pm.

y varies directly with x. When y = 20, x = 50. Find x when y = 36.

- algebra 2 -
**Steve**, Wednesday, September 19, 2012 at 1:22pm
since y varies directly with x, there is some constant k such that

y = k*x

Since y=20 when x=50,

20 = k*50

k = 2/5

Now you know k, and you can figure things out for other values

36 = 2/5 * x

x = 90

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