Posted by **Bobby Jones** on Sunday, September 30, 2012 at 2:01pm.

Determine the equation of combined, then solve for the missing value.

Variation x varies directly with y and z.

x=5 when y=10 and z=5. find x when y=20 and z=10

- ALGEBRA 1 -
**Reiny**, Sunday, September 30, 2012 at 3:08pm
"x varies directly with y and z" ---> x = k(yz), where k is a constant

given: when x=5, y = 10 and z = 5

5 = k(10)(5)

50k = 5

k = 1/10

then x = (1/10)yz

for y=20, z=10

x = (1/10)(20(10) = 20

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