1. 3.1 Graphing.notebook September 10, 2012
Objective: use graphing to solve systems of equations
Agenda
1. WU
2. Notes
3. Homework Warm Up
4. Test back
Solve for y.
5x + 3y = ­15
Systems of Linear Equations in Two Variables ­ Graphing and Substitution
GRAPHING
1. Write the equation in slope intercept form
2. Graph y­int (b)
3. From y­int use slope (m) to find another point
4. Draw a line (with straight edge)
5. Repeat steps 1 ­ 4 for the second equation
6. Find point of intersection
7. Write the solution as an ordered pair (x, y)
It is extremely important to draw straight
lines or your lines will not intersect.
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2. 3.1 Graphing.notebook September 10, 2012
3 Cases
m = m = m =
b = b = b =
1. 3x ­ 4y = 12
x + 4y = 4
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3. 3.1 Graphing.notebook September 10, 2012
2. x ­ 2y = 1
3x ­ 6y = 3
3. 3x ­ y = ­3
­3x + y = 5
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