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Solve Linear Equations | Special Systems in Two Variables

Learn to solve special systems of linear equations in two variables, classify systems, and determine solutions. Practice with examples and understand consistency and number of solutions.

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Solve Linear Equations | Special Systems in Two Variables

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  1. Warm Up Solve each equation. 1.2x + 3 = 2x + 4 2. 2(x + 1) = 2x + 2 3. Solve 2y – 6x = 10 for y no solution infinitely many solutions y =3x + 5 Solve by using any method. y = 3x + 2 x – y = 8 5. 4. (6, –2) (1, 5) 2x + y = 7 x + y = 4

  2. Objectives Solve special systems of linear equations in two variables. Classify systems of linear equations and determine the number of solutions.

  3. Systems with at least one solution are called consistent. A system that has no solution is an inconsistent system.

  4. Substitution y = x – 4 Solve . –x + y = 3 Inconsistent System.

  5. y = x – 4 Graph . –x + y = 3

  6. Substitution y =–2x + 5 Solve . 2x + y =1 Inconsistent System.

  7. y =–2x + 5 Graph . 2x + y =1

  8. If two linear equations in a system have the same graph, the graphs are coincident lines, or the same line. There are infinitely many solutions of the system because every point on the line represents a solution of both equations.

  9. y =3x + 2 Solve for y Solve . 3x – y +2= 0 Coincident Lines. There are infinitely many solutions.

  10. Solve for y y = x – 3 Solve . x – y –3 = 0 Coincident Lines. There are infinitely many solutions.

  11. Consistent systems can either be independent or dependent. An independent system has exactly one solution. The graph of an independent system consists of two intersecting lines. A dependent system has infinitely many solutions. The graph of a dependent system consists of two coincident lines.

  12. Classify the system. Give the number of solutions. 3y = x + 3 Solve x + y = 1 Solve for y The system is consistent and dependent. It has infinitely many solutions.

  13. Classify the system. Give the number of solutions. Solve for y x + y = 5 Solve 4+ y = –x The system is inconsistent. It has no solutions.

  14. Classify the system. Give the number of solutions. Distribute; Solve for y y = 4(x + 1) Solve y – 3 = x The system is consistent and independent. It has one solution.

  15. y = 20x + 100 y = 30x+ 80 y = 20x + 100 y = 30x+ 80 Matt has $100 in a checking account and deposits $20 per month. Ben has $80 in a checking account and deposits $30 per month. Will the accounts ever have the same balance? Explain. The accounts will have the same balance. The graphs of the two equations have different slopes so they intersect.

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