1) For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. x y
10 15
16 24
20 30

a) yes; y=1.5x
b) yes; y=2x
c) yes; y=x+5
d) y does not vary directly with x

2) Same as above.

x y
16 4
32 16
48 36

a) yes; y=2x
b) yes; y=4x
c) yes; y=8x
d) no; y does not vary directly with x

Thank you!

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?