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Unformatted text preview: y varies directly with x . If so, find the constant of variation. a. x y 2 3 = b. 10 4 7 = + y x c) 4 x y = Example 3) Writing a direct variation equation. A dripping faucet wastes one cup of water if it drips for three minutes. The amount of water wasted varies directly with the amount of time the faucet drips. a. Find the constant of variation, and write an equation to model the situation. b. How long would it take to waste 4 cups of water? You can also use a proportion to solve in direct variation situations. Example 4) a. Suppose y varies directly with x , and if y = 4 then x = 3. Find y when x = 6. b. Suppose y varies directly with x , and if y = 10 then x = -3. Find y when x = 2....
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