SOLUTION: If y varies directly as x, what is the value of y in these ordered pairs? (3, 12) and (24, y)

Question 613583: If y varies directly as x, what is the value of y in these ordered pairs? (3, 12) and (24, y)
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
You are told y varies directly with x. So you can write the equation as whre A is a constant. You are then given two points. Use the first point to solve for A. Then use the information in the second point to solve for y. As follows
plug int he coordinates from the first point and solve for A

plug A into the base equation to get
now plug in the second value for x and solve for y

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