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Exponential Decay
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Multiplying and Dividing Fractions 4
Evaluating Expressions Involving Fractions
The Cartesian Coordinate System
Adding and Subtracting Fractions with Like Denominators
Solving Absolute Value Inequalities
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FOIL Method
Inequalities
Solving Systems of Equations by Graphing
Graphing Compound Inequalities
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Addition Property of Equality
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Adding and Subtracting Fractions
The Distance Formula
Graphing Logarithmic Functions
Fractions
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Evaluating Polynomials
Power of a Product Property of Exponents
Terminology of Algebraic Expressions
Adding and Subtracting Rational Expressions with Identical Denominators
Solving Exponential Equations
Factoring The Difference of 2 Squares
Changing Fractions to Decimals
Solving Linear Equations
Using Patterns to Multiply Two Binomials
Completing the Square
Roots of Complex Numbers
Methods for Solving Quadratic Equations
Conics in Standard Form
Solving Quadratic Equations by Using the Quadratic Formula
Simplifying Fractions 2
Exponential Notation
Exponential Growth
The Cartesian Plane
Graphing Linear Functions
The Slope of a Line
Finding Cube Roots of Large Numbers
Rotating Axes
Common Mistakes With Percents
Solving an Equation That Contains a Square Root
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Properties of Common Logs
Composition of Functions
Using Percent Equations
Solving Inequalities
Properties of Exponents
Graphing Quadratic Functions
Factoring a Polynomial by Finding the GCF
The Rectangular Coordinate System
Adding and Subtracting Fractions
Multiplying and Dividing Rational Expressions
Improper Fractions and Mixed Numbers
Properties of Exponents
Complex Solutions of Quadratic Equations
Solving Nonlinear Equations by Factoring
Solving Quadratic Equations by Factoring
Least Common Multiples
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Solving Exponential Equations
Solving Linear Equations
Multiplication Property of Equality
Multiplying Mixed Numbers
Multiplying Fractions
Reducing a Rational Expression to Lowest Terms
Literal Numbers
Factoring Trinomials
Logarithmic Functions
Adding Fractions with Unlike Denominators
Simplifying Square Roots
Adding Fractions
Equations Quadratic in Form
Dividing Rational Expressions
Slopes of Parallel Lines
Simplifying Cube Roots That Contain Variables
Functions and Graphs
Complex Numbers
Multiplying and Dividing Fractions 1
Composition of Functions
Intercepts of a Line
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Multiplying Two Numbers with the same Tens Digit and whose Ones Digits add up to 10
Factoring Trinomials
Exponents and Polynomials
Decimals and their Equivalent Fractions
Negative Integer Exponents
Adding and Subtracting Mixed Numbers
Solving Quadratic Equations
Theorem of Pythagoras
Equations 1
Subtracting Fractions
Solving Quadratic Equations by Graphing
Evaluating Polynomials
Slope
Angles and Degree Measure
   
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Solving Systems of Equations Using Elimination

Objective: Solve systems of linear equations using elimination

Example 1)

3 x + 2 y = 2

-3 x + 2 y = 6

Add the equations
4 y = 8 Simplify
y = 8/4 = 2  
  Substitute using y = 2
3 x + 2(2) = 2  
3 x + 4 = 2 Simplify
3 x = -2  
x = -2/3 Solution (-2/3, 2)

Example 2)

- x - y = 8

-2 x - y = -1

Subtract the equations
x = 9 Substitute using x = 9
-9 - y = 8  
- y = 17  
y = -17 Solution (9, -17)

Example 3)

2 x = -3 y + 1

x + 2 y = -1

Rewrite in standard form
2 x + 3 y = 1

x + 2 y = -1

Multiply the 2nd equation by -2 then add
2 x + 3 y = 1

-2 x - 4 y = 2

Simplify
-y = 3

y = -3

Substitute using y = -3
x + 2(-3) = -1

x + -6 = -1

x = 5

Solution (5, -3)

Example 4)

3 x + 2 y = 1

2 x - 5 y = -2

Let’s eliminate the x
-2(3 x + 2 y ) = -2 (1)

3(2 x - 5 y ) = 3(-2)

Multiply the first equation by -2

Multiply the 2nd equation by 3

-6 x - 4 y = -2

6 x - 15 y = -6

Now add.
-19 y = -8 y

Now substitute
Simplify.
Solution:
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