Ratio and Unit Rate
Write the following as a ratio:
2 dogs to 6 cats
2/6
Slide 5
(3,2)
What are the rules in order for a graph to be proportional?
Straight line
Line must go through origin
y=kx
5 20
----- = -----
8 d
d=32
1/2 cup of milk for every 1/4 of sugar
1/2 : 1/4
1/2 / 1/4
Slide 6
(3,-4)
1 4
--- = ---
2 8
2 x
----- = -----
7 28
x=8
Slide 3
10
8
Slide 7
(-1,2)
Slide 1
It is proportional!
5 x
----- = -----
12 36
x=15
Slide 4
10
2
Slide 8
(3,-5)
Slide 2
It is NOT proportional
6 42
----- = -----
p 35
p=5
Find the Unit Rate:
165 miles in 3 hours
55 miles in 1 hour
55 : 1
55/1
Slide 9
(-1,-5)
1/2 8
------ = -----
1/4 4
Write the ratios as a proportion and find x.
x:5 and 8:2
x 8
----- = -----
5 2
x=20