If m varies directly as aand m is 6 when a is 36, find the constant of variation.
A. 
1/6
B. 
6
C. 
1/36
D. 
36
2.
There are about 200 calories in 50 grams of Swiss cheese. Willie ate 70 grams of this cheese. About how many calories were in the cheese that he ate if the number of calories varies directly as the weight of the cheese.
A. 
210
B. 
240
C. 
280
D. 
290
3.
One variable (A) varies directly as the other (C). Find the missing numbers x and y. A12xC3y15
A. 
X = 3, y = 6
B. 
X = 13, y = 4
C. 
X = 5, y = 6
D. 
X = 4, y = 9
4.
An enclosed gas exerts a pressure P on the walls of a container. This pressure is directly proportional to the temperature T of the gas. If the pressure is 7 lb per square inch when the temperature is F, find the constant of variation.
A. 
49
B. 
C. 
D. 
60
5.
Find the constant of variation, k, for the direct variation: 3x + 5y = 0