1) If y varies directly as​ x, and y=7 when x=6​, find y when x=12.

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter12: Quadratic Functions
Section12.8: Joint And Combined Variation
Problem 8P
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1) If y varies directly as​ x, and

y=7

when

x=6​,

find y when

x=12.
 
 
 
 
2)The pressure exerted by a certain liquid at a given point varies directly as the depth of the point beneath the surface of the liquid. The pressure at
70
feet is
24
pounds per square inch. What is the pressure at
140
​feet?
 
3)The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r. If a car traveling
50
mph can stop in
110
​ft, how many feet will it take the same car to stop when it is traveling
100
​mph?
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