Systems of equations
7 videos
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16
Pre-algebra - What Are Systems of Equations?
Learn what a system of equations is and how two equations with shared unknowns can be solved by finding where their lines intersect on a graph.
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Pre-algebra - How to Check if a Point Solves a System
Learn how to verify if a point is the solution to a system of equations by substituting values into both equations and checking if they are true.
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Pre-algebra - Solving Systems of Equations by Graphing
Learn how to solve systems of equations by graphing two lines and finding their intersection point, which represents the solution that satisfies both equations.
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Pre-algebra - Solving a System by Graphing: Step-by-Step
Learn to solve systems of linear equations by graphing two lines and finding their intersection point. Includes verification of the solution using both equations.
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15
Pre-algebra - Solving Systems by Substitution
Learn how substitution solves systems of equations by replacing one variable with an expression from another equation, turning two equations into one solvable problem.
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Pre-algebra - Substitution Method: Worked Example
Learn to solve systems of equations using substitution method with a real-world snack purchase problem. Find the cost of chips and drinks step-by-step.
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Pre-algebra - When a System Has No Solution
This video explains parallel lines in systems of equations. When two lines have the same slope but different y-intercepts, they never intersect and have no solution.