Direct Variation Quick Check
 What is the constant of variation in the following equation?y = 3x y 9 x 3 What is the constant of proportionality in the table above?xy 4 1 2 ¼4182123164205 No, because it's linearNo, because it doesn'tpass through through the origin.Yes, because it's linear Yes, because it passes through the origin.Does this graph represent direct variation? Explain. If the constant of variability is 8 and y=24, what is the value of x? 2192 316 Write an equation for the following situation: Marcus drove 90 miles in two hours. y = 2x y = 90x y = 45x y = 180x Which of the graphsrepresents adirect variation?a)c)b)d) What is the unit rate for the above data table?xy 3 21.5 2  3  4 64698121015 Which of the following tables represents a  direct variation (proportional)?a)b)yyxx 281316424 24356c)d)xyxy1002-42400 8484 Which of the following equations is a direct variation?  y = 7x  y = 3x - 1  y = 5  2x -5y = 10 2-24-46-62-24-46-68-810-10Write an equation to represent this graph.x = 2y x = 4yy = xy = 2x
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