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Determine whether y varies directly with x if so find the constant of variation k and write the equation?
X line is y line is
4. 6.4
7. 11.2
10. 16
13. 20.8
if so, y/x is constant
6.4/4 = 1.6
11.2/7 = 1.6
16/10 = 1.6
looks good, no?