Alg 2 – 4.13.15 Solving Systems of Equations Foldable and Problems
Alg 2 – 4.13.15Solving Systems of Equations Foldable and Problems
Do Now –Convert 2x – 6y = -12 to slope-intercept form and graph.
Agenda1. Do Now2. Warm up3. Goals & Objectives4. Solving systems of equations
foldable5. Solving systems by equations
practice5. Closure/Exit ticket
Warm UpDo I have enough money to do a load of laundry at the laundry mat?6 quarters to wash2 quarters to dry
Goal: I will learn three ways to solve a system of equations.
Objective: I can explain the three ways to solve a system of equations.
Make your own foldable on Solving Systems of Equations
On your foldable, write the main heading
Solving Systems of Equations
Continue to write more headings.
Solving Systems of Equations
Definition
Graphing
More headings
Solving Systems of Equations
Substitution
Elimination
Last heading
Solving Systems of Equations
Types of Solutions
Under first flap, write:“A system of equations is 2 or more equations.”
Solving Systems of Equations
Under the second flap, write:1) Convert equations into slope-intercept form.2) Graph the y-intercept3) Start at the y-intercept, and use the slope to find the next point.4) Draw the line5) Repeat Solving Systems of Equations
Example solving by graphing problem for the foldable:
𝐲 =𝟏
𝟑𝒙 + 𝟏 𝒂𝒏𝒅 𝒚 = 𝟐𝒙 − 𝟒
Practice problem #1:
𝒚 = −𝟐
𝟑𝒙 + 𝟏 𝒂𝒏𝒅 𝒚 = −
𝟐
𝟑𝒙 + 𝟑
Practice Problem #2:
𝒚 = 𝟒𝒙 + 𝟑 𝒂𝒏𝒅 𝒚 = −𝒙 − 𝟐
Under the third flap, write:1) Solve for one variable in terms of the other.2) Substitute the expression into the other equation.3) Solve for one variable.4) Solve for the other variable.5) Check your solution.6) Write as an ordered pair. Solving Systems of Equations
Problem using substitution for your foldable:
2x + y = -1 and x = 2y - 13
Practice Problem using substitution :
y = -3x + 5 and 5x – 4y = -3
(1,2)
2nd practice problem using substitution :
y = 5x – 7 and -3x – 2y = -12
(2.3)
Under the fourth flap, write:1) Convert equations (if necessary) to up the x-terms, y-terms, =, and constants.2) Decide which variable is easier to eliminate.3) Multiply one or both of the equations by a number (if necessary)4) Combine the equations.5) Solve for one variable.6) Solve for the other
variable.7) Check your solution.8) Write your solution as an ordered pair.
Solving Systems of Equations
Example problem solved by elimination for your foldable:3x + y = 2 and x – 2y = 10
(2,-4)
Example practice problem #1:
-7x + y = -19-2x + 3y = -19
(2,-5)
Example practice problem #2:16x – 10y = 10-8x – 6y = 6
(0,-1)
Under fifth flap, draw and write:
One point No solution Infinite Solutions
Lines intersect Parallel lines Same line
Exit ticket:*Describe, in your own words, the three ways you can solve a system of equations.*Describe how you might decide which method would be the best to use for particular cases.