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# Module 4 topic 3 notes

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### Module 4 topic 3 notes

1. 1. Module 4 Topic 3<br />Writing Linear Equations<br />
2. 2. The equation for slope-intercept form is<br />m is the slopeslope measures the <br /> steepness of the linem=-4/2=-2<br />b is the y-interceptb is where the <br /> line crosses the y-axis.<br />Writing Linear Equations<br />2<br />-4<br />
3. 3. Write the equation of the line that has a <br />slope of -4 and y-intercept of 5.<br />Writing Linear Equations<br />
4. 4. Writing Linear Equations<br />We use Point-Slope form, when we are given: a point and a slope!<br />
5. 5. Point Slope Form<br />Write the equation of the line that passes through (-3,5) and has a slope of 2.<br />What are we given? We are given the slope is 2!<br />AND…we are given a point (-3,5).<br />Final Answer<br />
6. 6. Point Slope Form<br />Write the equation of the line that passes through (-3,5) and (-1,9) .<br />Can we find the slope? Do we have enough info?<br />What are we given? We are given 2 points, but no slope! <br />Yes, we can use… <br />
7. 7. Point Slope Form<br />Write the equation of the line that passes through (-3,5) and (-1,9) .<br />Now that we know that the slope is 2, we can use either point to find the equation of the line. <br />
8. 8. Writing Linear Functions<br />Summary<br />When given the slope and y-intercept: y=mx+b.<br />When given 1 point and the slope, do point slope: y – y1=m(x-x1).<br />When given 2 points, and no slope, one must find the slope(m=y2-y1over x2-x1), then use either point for the point slope form.<br />Now proceed to Mastery Assignments!<br />