1. Systems of Linear Equations
Objective: students will use substitution to find the solution of a linear system.

2. Steps
Take one equation and solve for x or y.
Take what you get from one and substitute into other equation.
Solve the equation
Take what you get and put into other equation and solve
Write as an ordered pair
Ex: x + y = -3 x – y = -3

3. Find # of solutions
Y = 4x + 2
Y = x + 2

4. Find # of solutions
x + y = 3
x – y = -5

5. Find # of solutions
Y = -x - 4
y = x + 4

6. Find # of solutions
Y = x - 4
4x + y = 26

7. Find # of solutions
S = t + 4
2t + s = 19

8. Find # of solutions
2c – d = -2
4c + d = 20

9. Find # of solutions
U – v = 0
7u + v = 0

10. Find # of solutions
2a = 8
A + b = 2

11. Wrap-up
Question/Comments
Hw: Problems

12. Use substitution to find a solution
P + q = 4; 4p + q = 1 M + 2n = 1; 5m + 3n = -23 3x + y = 3; 7x + 2y = 1 2x + y = 4; -x + y = 1