Algebra 2
Review Chapter 3
Name __________________________________
Without graphing, classify each system as independent, dependent, or inconsistent.
1.
6 x  3 y  12

 y  2 x  4
2.
y  x  5

 x  y  3
4.
5 x  3 y  12

 x  5 y  20
6.
2 x  3 y  4

4 x  6 y  9
Solve using substitution.
3.
3x  5 y  10

 y  4
Solve using elimination
5.
2 x  y  13

 x  y  3
Solve each system by graphing.
 y | x  4 |

8. 
1
 y  3 x
y  x  1

7. 
3
 y  4 x  6
8
8
6
6
4
4
2
2
-8 -7 -6 -5 -4 -3 -2 -1
1 2 3 4 5 6 7 8
-8 -7 -6 -5 -4 -3 -2 -1
-2
-2
-4
-4
-6
-6
-8
-8
1 2 3 4 5 6 7 8
Graph each system of constraints. Find all vertices. Then find the variable values that maximize or minimize the objective
function.
x  2

10.  y  0
3x  2 y  12

Minimum for C  4 x  y
x  8

9.  y  5
 x  0, y  0

Maximum for C  x  5 y
11. Profit
A lunch stand makes $.75 profit on each chef salad and $1.20 profit on each Caesar salad. On a typical weekday, it
sells between 40 and 60 chef salads and between 35 and 50 Caesar salads. The total number sold has never exceeded
100 salads. How many of each type should be prepared in order to maximize profit?
Solve each system (attach paper to NEATLY show work).
 x  y  z  10

12. 2 x  y  z  2
 x  2 y  z  5

 x  2 y  z  14

13.  y  z  1
 x  3z  6

3x  y  2 z  22

14.  x  5 y  z  4
 x  3z

15. Earnings A student can make a weekly salary of $200 plus 15% commission on sales at the Radio Barn or a weekly salary
of $300 plus 10% commission on sales at Woofer, Etc. For what amount of sales do these two jobs pay the same?
16. You have $10,000 in a savings account. You want to take most of the money out and invest it in stocks and bonds. You
decide to invest nine times as much as you leave in the account. You also decide to invest five times as much in stocks
as in bonds. How much will you invest in stocks, how much will you invest in bonds, and how much will you leave in
savings?
Let x = stocks
y = bonds
z = savings
1.
2.
3.
4.
5.
dependent
independent
(10, -4)
(0, 4)
6.
no solution