8M: 5-5 QC (Direct Variation)
1.  Check ALL the equations below that show a      function that would be a direct variation.
y = 5x + 6
y = -¾x + 4
y = 5x
y = -4x
y = ⅝x
x = 9
2
-2
4
-4
2
-2
4
-4
6
-6
2.  Which graph shows 
     a direct variation?
A
B
C
A
C
B
3.  Check ALL the equations below that show a      function that would be a direct variation.
y = 5x
y = -x + 4
y = -2x + 5
y = -4
y = 10x
y = -⅔x
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
4.  Which graph shows      a direct variation?
A
B
C
A
C
B
5.  Which table below shows a directly proportional
     relationship?
Table A
-1
0
1
2
x
-10
-5
0
y
5
Table B
30
10
20
x
0
25
20
30
15
y
Table C
0
-1
-3
-2
x
10
y
8
9
7
6.  Which table below shows a directly proportional     relationship? (Hint: find when x = 0 in all tables.)
Table A
-1
0
1
2
x
36
22
29
15
y
Table B
20
10
15
x
5
12
6
9
3
y
Table C
-1
-2
-4
-3
x
10
y
8
9
7
7.  TRUE or FALSE.  The situation below shows a
     function that would be a directly proportional
     relationship.

Carter already has $100 in his savings account
and plans to add $15 a week.  He is saving for a 
new bike.
TRUE
FALSE
8.  TRUE or FALSE.  The situation below shows a     function that would be a directly proportional     relationship.
Carter is opening a savings account for the first timeand plans to add $20 a week.  He is saving to attend a basketball camp over the summer.
TRUE
FALSE
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