The variables a and b vary directly. Use the given values for a and b to write an equation relating a and b a=3; b=15

a = 1/5 b

Step-by-step explanation:

A direct variation is given by

a = k*b where k is the constant of variation

3 = k* 15

Divide each side by 15

3/15 = k*15/15

1/5 = k

a = 1/5 b

a = 1/5 b

Step-by-step explanation:

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its 4 because 2 times 2 is 4, if you double the number two you get four