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4.2,4.3 graphing

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Algebra 1

Algebra 1
4.2 and 4.3 slideshow

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4.2,4.3 graphing 4.2,4.3 graphing Presentation Transcript

  • Graphing Linear Equations 4.2 p. 210
    • A solution to an equation is an ordered pair ( x, y ) that makes the equation true .
    • A solution to an equation is an ordered pair ( x, y ) that makes the equation true.
    • The graph of an equation is the set of all the solutions.
    • A solution to an equation is an ordered pair ( x, y ) that makes the equation true.
    • The graph of an equation is the set of all the solutions.
    • The graph of a linear equation is a line .
  •  
  • Graphing an Equation
    • Rewrite the equation by solving for y .
  • Graphing an Equation
    • Rewrite the equation by solving for y .
    • Choose a few values for x and make an input/output table .
  • Graphing an Equation
    • Rewrite the equation by solving for y .
    • Choose a few values for x and make an input/output table.
    • Plot each ordered pair.
  • Graphing an Equation
    • Rewrite the equation by solving for y .
    • Choose a few values for x and make an input/output table.
    • Plot each ordered pair.
    • Connect the points with a straight line.
  • Horizontal and Vertical lines
    • The graph of y = b is a horizontal line.
      • “ b” means any number.
    y = 2
  • Horizontal and Vertical lines
    • The graph of x = a is a vertical line.
      • “ a” means any number.
    x = - 3
  • Horizontal and Vertical lines
    • What is the “x” value for any point on the line x = -3?
    x = - 3
  • Intercepts 4.3
  • Intercepts
    • The x-intercept is the point where a graph crosses the x-axis .
  • Intercepts
    • The x-intercept is the point where a graph crosses the x-axis.
    • The y-intercept is the point where a graph crosses the y-axis .
  • Finding Intercepts
    • To find the x-intercept of a graph, plug in y=0 and solve for x.
  • Finding Intercepts
    • To find the x-intercept of a graph, plug in y=0 and solve for x.
    • To find the y-intercept of a graph, plug in x=0 and solve for y.