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# Module 4 topic 3

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### Module 4 topic 3

1. 1. Module 4 Topic 3 Writing Linear Equations
2. 2. <ul><li>The equation for slope-intercept form is </li></ul><ul><li>m is the slope  slope measures the </li></ul><ul><li>steepness of the line  m=-4/2=-2 </li></ul><ul><li>b is the y-intercept  b is where the </li></ul><ul><li>line crosses the y-axis. </li></ul>-4 2
3. 3. <ul><li>Write the equation of the line that has a </li></ul><ul><li>slope of -4 and y-intercept of 5 . </li></ul>
4. 4. We use Point-Slope form, when we are given: a point and a slope!
5. 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. 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. 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. 8. <ul><li>Summary </li></ul><ul><li>When given the slope and y-intercept : y=mx+b. </li></ul><ul><li>When given 1 point and the slope , do point slope: y – y 1 =m(x-x 1 ). </li></ul><ul><li>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. </li></ul>Now proceed to Mastery Assignments!