Try the following: 

1. 
If
m
varies directly as y
and m is 6 when
y
is 36, find the constant of variation.

Choose:




2. 
"a
varies directly as b". If a = 3 when b = 24,
find b when a = 10.

Choose:




3. 
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.

Choose:




4. 
In the following
chart, does one variable vary directly with the other?
M 
3 
4 
5 
6 
7 
N 
6 
8 
10 
12 
14 

Choose:




5. 
In the following
chart, does one variable vary directly with the other?
X 
1 
2 
3 
4 
5 
Y 
1 
4 
9 
12 
15 

Choose:




6. 
One
variable (A) varies directly as the other (C).
Find the missing numbers x and y. Write the
formula which relates the variables.

Choose:




7. 
The
resistance (R) of a copper wire, varies directly as its
length (L). Write this relation as a formula using
k as the constant of variation.




8. 
A salesman's
commission varies directly as his sales. Write the
formula relating this situation and denote the
variables. If the commission is $100 for $1000 in
sales, find the commission for $1750 in sales.

Choose:




9. 
The distance an object, a,
drops from rest in freefall varies directly with the
square of the time, t.
If a
varies directly as t^{2},
and a
= 12 when t
= 2, find a
when t = 3.

Choose:




10. 
Which equation represents:
x varies directly
as y,
and
x = 12 when y =
36? 
Choose:




11. 
Which graph represents a direct variation?
Choose:




