1. Academy Algebra II 3.1: Solve Linear Systems by Graphing
HW: p.156 (4, 8, 10, 12), review old graphing: absolute value, quadratics, etc.
Quiz 3.1, 3.2: Friday
10th graders: Ch 3 Test: Wednesday, 3/4
9th graders: Ch 3 Test: Monday, 3/9

2. How to solve linear systems graphically.
Graph both lines in the same coordinate plane.
Your solution is the ordered pair where the two lines intersect.
What would be the solution if the lines do not intersect?
What would be the solution if the lines overlap each other?

3. Find the solution to the system graphically.
y = -3x – 2
3x + 2y = 2

4. Find the solution to the system graphically.
x = -4
3.) 2x + y = 4
-4x - 2y = -2
4.) y = -1
3x + y = 5

5. Find the solution to the system graphically.
2x + y = 4
-4x - 2y = -2

6. Find the solution to the system graphically.
3x + y = 5

7. Academy Algebra II 3.2: Solve Linear Systems Algebraically
HW: 164 (28-38 even), p.182 (10, 18)
Quiz 3.1, 3.2: Friday
10th graders: Ch 3 Test: Wednesday, 3/4
9th graders: Ch 3 Test: Monday, 3/9

8. What are the two algebraic methods of solving a system of equations?
Substitution
Elimination (linear combinations)

9. Solve the system using the substitution method.
2x + 5y = -5
x + 3y = 3

10. Solve the system using the elimination method.
3x – 7y = 10
6x – 8y = 8

11. Academy Algebra II 3.2: Solve Linear Systems Algebraically
HW: p.164 (28-38 even), p.182 (10, 18)
Quiz 3.1, 3.2: Friday
10th graders: Ch 3 Test: Wednesday, 3/4
9th graders: Ch 3 Test: Monday, 3/9

12. 3.4: Solve the system. 4x + 2y + 3z = 1 2x – 3y + 5z = -14

13. Solve the system using the substitution or elimination method.
1.) 4x + 3y = -2 2.) 3x + 3y = -15
x + 5y = x – 9y = 3
3.) 3x – 6y = 9 4.) 12x – 3y = -9
-4x + 7y = x + y = 3

14. Solve the system using the substitution or elimination method.
3.) 3x – 6y = 9 4.) 12x – 3y = -9
-4x + 7y = x + y = 3

15. To raise money for uniforms, your school sells
t-shirts. Short sleeve t-shirts cost $5 each and are
sold for $8 each. Long sleeve t-shirts cost the
school $7 each and are sold for $12 each. The
school spends a total of $2500 on t-shirts and
sells all of them for $4200. How many short
sleeve t-shirts are sold?

16. p.165 # 55
In one week, a music store sold 9 guitars for a
total of $3611. Electric guitars sold for $479 each
and acoustic guitars sold for $339 each. How
many type of each guitar were sold?