Solve A System Of Equations By Graphing

🔑 Key Concepts

  • Rewrite each equation in slope-intercept form, \(y=mx+b\), before graphing.
  • The slope \(m\) determines the direction and steepness of each line.
  • The y-intercept \(b\) identifies where each line crosses the y-axis.
  • The solution to a system is the point where the two lines intersect.
  • The intersection point satisfies both equations at the same time.
  • Parallel lines have no solution, while the same line represents infinitely many solutions.

✏️ Worked Example — Solving a System by Graphing

🧠 Math Vocabulary

  • System of equations: Two or more equations containing the same variables.
  • Slope-intercept form: The form \(y=mx+b\), where \(m\) is the slope and \(b\) is the y-intercept.
  • Intersection: The point where two graphed lines meet.
  • Solution of a system: The ordered pair that satisfies every equation in the system.
  • Ordered pair: A point written as \((x,y)\).
  • Consistent system: A system that has at least one solution.

💡 Main Idea

To solve a system by graphing, rewrite both equations in slope-intercept form and graph them on the same coordinate plane. The ordered pair where the lines intersect is the solution because it makes both equations true.

📚 What You Should Already Know

Students should know how to isolate \(y\), graph linear equations using slope and y-intercept, perform operations with fractions, and plot ordered pairs on a coordinate plane.

🚀 What Comes Next

Students will compare graphing with substitution and elimination, identify systems with no solution or infinitely many solutions, and apply systems of equations to real-world situations.

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