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Mathematics
OpenStudy (anonymous):

Determine whether y varies directly with x. If so, find the constant of variation k and write the equation. X: 6 11 16 21 Y: 7.2 13.2 19.2 25.2 yes; k = 1.2; y = 1.2x yes; k = 5; y = 5x yes; k = 6; y = 6x no

OpenStudy (mani_jha):

X and Y will have a direct variation if you can express it in the form of a straight line Y=mX+c. You need to find m using the formula (y2-y1)/(x2-x1) Take for example, y1= 7.2 y2=13.2 and x1=6 x2=11 Your job is to find the difference between any two consecutive values of X and difference between two consecutive values of Y. Now divide the difference in Y by difference in X. If the result is the same throughout, it is a direct variation. The constant of variation is the slope Did you get this?

OpenStudy (anonymous):

1.2?

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