| NOTE FOR SPRING 06, THIS
SEMESTER: TEST 2 = WEDNESDAY, APRIL 5TH ON QUIZZES 6-9 |
| answers: b c b b a b c a |
| 7.3
|
1. solve by elimination:
2x + 2y = 24
-2x + 4y = 30
The solution for y is a value between:
|
| a0
and 5 |
| b5
and 10 |
| c10
and 15 |
| dnone
of the above |
| 2. In the previous problem, the value for x
is between:
|
|
a-2 and 0 |
|
b0 and 2 |
|
c2 and 4 |
|
dnota |
| 7.4 |
| 3. In a recent game, JT of the ATL Hawks
scored 24 points in 9 shots. Some of these shots were of
type two-point and some of them were of type three-point. The equations
for this problem are : |
a
x + y = 24
2x + 3y = 9 |
b
x + y = 9
2x + 3y = 24 |
|
cnota |
|
d |
| 4. In the previous problem, the value for y
is between:
|
|
a 0 and 3 |
|
b3 and 7 |
|
c7 and 10 |
|
dnota |
| 5. In the previous problem, the
value for x is : |
|
a 3 |
|
b6 |
|
c 9 |
|
dnota |
| 7.3 |
6. Solve by elimination:
2x + 2y = 12
-4x + 4y = 24
The solution for y is a value between: |
|
a0 and 5 |
|
b5 and 10 |
|
c10 and 15 |
|
dnota |
| 7. In the previous problem, the value for x
is : |
|
a3 |
|
b1 |
|
c0 |
|
dnota |
| 7.4 |
| 8. At the Hayward flea market,
Frank made $24 dollars in 9 sales of hats. Some of these
hats cost $2 and some of them cost $3. The equations
for this problem are : |
a
x + y = 9
2x + 3y = 24 |
b
x + y = 24
2x + 3y = 9 |
|
cnota |
|
d |
| written problems: |
| 9. In the previous problem, what is the
number of $3-hats sold? Show work !!!! y = 6. Solve for y
using substitution. |
| 10. In the previous problem, what is the
number of $2-hats sold? Show work !!!! x = 3 |
11. Graph y > 2x + 1 by shading
the correct part of the plane. (Hint: First graph the line
y = 2x + 1. Then shade where the points have values of y > 2x +
1 .) Answer: start at (0,1), then run 1, then rise 2 to get
to new point ( 1, 3). Draw a line through these two points. The shade
above the line. |