Transcript Algebra 1 Section 7.1 Solve systems of linear equations

Algebra 1 Section 7.1
Solve systems of linear equations by graphing
Recall: linear equation in 2 variables ax + by = c
The solutions to a system of linear equations are all ordered
pairs that are solutions to each equation.
Is the ordered pair ( 2,3) a solution to the system:
5x – 2y = 4
3x + 2y = 12
The solution to a system of
equations are the point(s)of
intersection of the graphs.
To solve a system of linear equations by graphing
1. Graph each equation
2. Find their intersection
Solve the system
-x + 2y = 6
x + 4y = 24
Solve
x+y=3
-2x + y = -6
Solve using a graphics calculator
¾x–¼y=-½
¼ x – ¾ y = 3/2
Page 400 ex 3
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assignment
• Page 401
• Problems 12 – 36 even, 37,38,39