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Graph the line whose x-intercept is 5 and whose y-intercept is 9

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3 answers

  1. Which unit and lesson?

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  2. mark two points
    x = 0, y = 9
    x = 5, y = 0
    draw a line through them
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    Let's find an equation for the line to make it all clear
    y= m x + b
    when x = 0, it hits the y axis at b = 9
    so y = m x + 9
    when y = 0, it hits the x axis at x = 5
    so
    0 = 5m + 9
    m = -9/5
    so
    y = -9/5 x + 9

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  3. plot the two intercepts
    draw the line through them

    for the equation, use the intercept form
    x/5 + y/9 = 1

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