Algebra 1 Section 4.5 Solve direct variation problems

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Algebra 1 Section 4.5 Solve direct variation problems The cost of filling up your gas tank depends upon the number of gallons of gasoline that you buy. As the number of gallons bought increases, so does the total cost. This is an example of a direct variation. Number of gallons Cost in $ 1 2.25 2 4.50 3 6.75 4 9.00 Direct Variation Equation y varies directly as x y = kx k is the constant of variation

Cost – gallons problem The graph of a direct variation is a line that passes through the origin and it has a slope of k. C = 2.25 g

example y varies directly as x. If y = 15 when x = 3, find: A. The equation relating x and y. B. The value of y when x = 7

Example 3 page 235 Page 237 Problems 12-32 even, 33,44,58