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Learn how to identify and solve problems involving direct, inverse, and combined variation in algebraic equations. Get step-by-step explanations and examples to master this algebra concept.
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Ex 1 Suppose that x and y vary inversely. If x = 7 and y = 4, write a function.
Ex 2 • Direct, inverse, or neither?
Ex 3 • Direct, inverse, or neither?
Ex 4 • Direct, inverse or neither?
Combined variation • y varies directly with the square of x: y = kx2 • y varies inversely with the cube of x: y = k/x3 • z varies jointly with x and y and inversely with w: z = kxy/w • z varies directly with x and inversely with the product of w and y: z = kx/wy
Ex 5 Mass m of a moving object is related to its kinetic energy k and its velocity v by m = 2k/v2. Describe the relationship using combined variation.
Ex 6 Describe using combined variation:
Ex 7 The area of an equilateral triangle varies directly with the square of the radius r of its circumscribed circle. The area of an equilateral triangle for which r =2 is