Downloaded 30 times
Module 4 topic 3
This document discusses writing linear equations from different information provided. It explains that the slope-intercept form is y=mx+b, where m is the slope and b is the y-intercept. It also explains that the point-slope form, y-y1=m(x-x1), is used when given a point and the slope. Finally, it notes that when given two points, the slope must first be calculated as m=(y2-y1)/(x2-x1) before using the point-slope form.
Module 4 topic 3
- 1. Module 4 Topic3 Writing Linear Equations
- 2. The equation forslope-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 equationof the line that has a slope of -4 and y-intercept of 5 .
- 4. We use Point-Slopeform, when we are given: a point and a slope!
- 5. Write the equationof 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 equationof 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 equationof 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 giventhe 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!