Module 4 topic 3 notes
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Transcript

  • 1. Module 4 Topic 3 Writing Linear Equations
  • 2.
    • The equation for slope-intercept form is
    • m is the slope  slope measures the
    • steepness of the line  m=-4/2=-2
    • b is the y-intercept  b is where the
    • line crosses the y-axis.
    -4 2
  • 3.
    • Write the equation of the line that has a
    • slope of -4 and y-intercept of 5 .
  • 4. We use Point-Slope form, when we are given: a point and a slope!
  • 5. Write the equation of the line that passes through (-3,5) and has a slope of 2. What are we given? We are given the slope is 2! AND…we are given a point (-3,5). Final Answer
  • 6. Write the equation of the line that passes through (-3,5) and (-1,9) . What are we given? We are given 2 points, but no slope! Can we find the slope? Do we have enough info? Yes, we can use…
  • 7. Write the equation of the line that passes through (-3,5) and (-1,9) . Now that we know that the slope is 2, we can use either point to find the equation of the line.
  • 8.
    • Summary
    • When given the slope and y-intercept : y=mx+b.
    • When given 1 point and the slope , do point slope: y – y 1 =m(x-x 1 ).
    • When given 2 points, and no slope , one must find the slope (m=y 2 -y 1 over x 2 -x 1) , then use either point for the point slope form.
    Now proceed to Mastery Assignments!