# solving a system in three variables   41 videos

• #### Solving Multi-step Equations

##### AlgebraSolving Equations

How to solve multi-step equations.

expressions equations solutions implying like terms combining like terms
• #### Selling Multiple Items

##### AlgebraWord Problems Using Systems of Equations

How to set up a system of equations to represent word problems where someone is selling multiple items.

system of equations coefficient elimination
• #### Coin Word Problems

##### AlgebraWord Problems Using Systems of Equations

How to solve word problems about values and number of coins.

coins system of equations substitution
• #### Age Word Problems

##### AlgebraWord Problems Using Systems of Equations

How to solve word problems about the ages of two people.

age system of equations substitution
• #### Graphing 2 Variable Inequalities

##### AlgebraSolving and Graphing Inequalities

How to graph inequalities in the xy plane.

inequality y = mx+b Cartesian Coordinate plane shading
• #### Solving Rational Equations with Like Denominators

##### AlgebraRational Expressions and Functions

How to solve rational equations by clearing the denominator.

clearing the denominator common denominator excluded value
• #### Solving Rational Equations with Unlike Denominators

##### AlgebraRational Expressions and Functions

How to solve rational equations with unlike denominators.

common denominator excluded value
• #### Solving Quadratic Equations Using Square Roots

How to solve quadratic equations using square roots.

square root
• #### Work Word Problems

##### AlgebraWord Problems Using Systems of Equations

How to solve word problems when 2 people are doing a work job together.

ratio word problem system of equations work
• #### Rate Word Problems

##### AlgebraWord Problems Using Systems of Equations

How to solve word problems involving rates of travel, possibly including wind or water current.

rate ratio d=rt word problem system of equations
• #### Direct Variation

##### AlgebraLinear Equations and Their Graphs

How to tell if two variables vary directly.

direct variation y intercept constant of variation
• #### Inverse Variation

##### AlgebraLinear Equations and Their Graphs

How to tell if two variables vary inversely.

inverse variation constant of variation product rule for inverse variation
• #### Proportions

##### AlgebraSolving Equations

How to solve proportions.

ratio proportion fraction cross multiply
• #### Scatterplots and Correlations

##### AlgebraIntroduction to Statistics

How to identify positive correlations, negative correlations, or no correlation between two variables.

scatterplot correlation trend line line of best fit
• #### Linear Inequalities

##### AlgebraSolving and Graphing Inequalities

How to notate solving and graphing inequalities.

inequality notation
• #### Absolute Value Equations

##### AlgebraAbsolute Value

How to solve equations with absolute values.

absolute value solutions
• #### Completing the Square

How to solve a quadratic equation by completing the square.

completing the square perfect square trinomial

• #### Mixture Problems

##### AlgebraWord Problems Using Systems of Equations

How to solve word problems when mixing two quantities with different prices.

amount price mixture word problem
• #### Sum of Digits

##### AlgebraWord Problems Using Systems of Equations

How to solve a problem when asked to switch the digits of a 2-digit number.

sum digits word problem