A

B

C

D

E

$y=\frac{1}{2}x$

$y=x+2$

$y=2x+4$

$y=2x$

17.5

30

70

105

$5y=5x$

$5y=15x$

$4y=5x$

$3y=15x$

All three are proportional because they can all be graphed and will be a straight line.

The table is proportional because the y values are a multiple of 2.

The equation is proportional because it is in the form y=mx+b.

The graph is proportional because it is a straight line that passes through the origin.

The point (2, 100) means that there are 100 pounds of wild rice in two bags.

The data represents a proportional relationship.

The equation x=50y represents the situation.

The constant of proportionality is 50.

1.5

13.5

22.5

67.5

 $\frac{2}{3}$  gallon per lawn

 $\frac{2}{3}$  lawn per gallon

 $\frac{3}{2}$  gallon per lawn

 $\frac{3}{2}$  lawn per gallon

The point (2, 3) means there are 3 cups of flour for every 2 cups of butter.

The point (3, 2) means there are 3 cups of butter for every 2 cups of flour.

The point (4, 6) means there are 4 cups of flour for every 6 cups of butter.

The point (6, 4) means there are 4 cups of butter for every 6 cups of flour.

y=x

y=2x

y=3x

y=4x

The point (0,0) is the unit rate.

The car is traveling at a rate of 45 miles per kilometer.

It took 2 hours to travel 90 kilometers.

The point (1, 45) is the unit rate.

The point (4, 30) means the car has traveled 30 miles in 4 hours.

$\frac{x}{y}=\frac{2}{5}$

$3x+2=0$

$y=0.75x-2$

$y=\frac{1}{4}x$