Today we learned about trend lines, which are also called line of best fit. These are lines that represent the overall behavior of the points on a scatter plot. We learned how to draw a trend line, and then we figured out the equation of our trend line. We used slope-intercept form for our equations, which is y=mx+b. Today we started learning how to solve a system of equations by using elimination, which means we get rid of a variable. We can eliminate a variable by adding or subtracting the equations together. If the variables have opposite coefficients then we add the equations together. If the variables have the same coefficients then we subtract the equations together.
The UNIT 4 test is on Friday, December 16th. Below are some music videos to help you review systems of equations.
Today we learned about solving a system of equations by using substitution.
If you need help with substitution, check out the notes and videos below. They review the kinds of problems we solve in lesson 6-4. Need some extra practice graphing in slope-intercept form? You can practice use the super easy IXL graph practice HERE.
(See pictures below). Still struggling? Watch the videos in yesterday's post, 6-3 Solving Systems by Graphing. |
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