Review Section 7.1
1. Solve a system by substitution
3x + 2y = 14
x - 2y = 10
2. Find all points of intersection
4x - y - 5 = 0
4x2 - 8x + y + 5 = 0
3. Solve the system graphically
3x + 2y = 6
y = ln(x - 1)
Lesson
7.2 Systems of Linear Equations in Two Variables Objectives: Students will know how to solve systems of equations by elimination.
I. Method of Elimination p. 500
This method works on systems of linear equations and a few systems that include nonlinear equations. In general, substitution is a better method for solving systems involving nonlinear equations.
Example 1 - Eliminate by adding
Example 2 - Obtain opposite signs by multiplying, then eliminate by adding
Guided practice
p. 505 #14, 16, 20
II Graphical Interpretation of Solutions p.501
Example 3 Recognizing Graphs of Linear Systems
III Applications p.504
Example 7 - Airplane Speed
Homework
p. 505 - 507
# 3 - 30 x 3's, #66
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