Sixth Grade
Today's assignment is lesson 76. Remember to draw the diagram of the problem. It will be part of the answer!
Seventh Grade
The only assignment that is due tomorrow is Spelling Unit 25!
Today, the class took a test in Vocabulary and watched the Twilight Zone episode titled, "The Monsters are Due on Maple Street" which was presented as a play in our Literature book. It is an excellent example of what can happen when people jump to conclusions with little information. There will be a selection test over the play tomorrow after we discuss the it a little more.
In math, we spent the time going over the proportions assignment that was fairly tough for many of the students. I decided to take a completion grade for it and we will do another assignment with proportion word problems tomorrow.
8th Grade
Lesson 6-9. #2-18 All. Also, choose ONE of the word problems and if you get it right, you will get 5 extra credit percentage points. If you ATTEMPT a problem (a true attempt), I'll add ONE extra point.
Remember, the equation for direct variation is: y = kx, where y and x are variables that you are given and k is the "constant of variation". If you have direct variation, then the k will be the same for each set of x and y values. Also, you can use the equation: k = y/x. So, if you need to find the constant of varation (k), just take the y value and divide it by the x value! That is ALL you are doing on the back page.
On the front page, for #2-4, you are trying to determine whether the given information shows direct variation. If it does, then the proportions will be the same. You will just take the y value (on the bottom row), divide it by the x value (on the top row) for each set of numbers. If ALL of your division answers are the same, then you have direct variation. For example:
x = 40 tickets y =$160
x = 60 tickets y =$240
x = 70 tickets y = $280
So, you would take each y and divide it by the x.
160/40 = $4
240/60 = $4
280/70 = $4
So, you have direct variation! If any of them were different, you would NOT have direct variation.
For #5-6, just graph the information given on a graph. Remember to draw it like an "L" not a plus sign. x-values go across the bottom and y-values go up the side. Once you've graphed the information, if you can draw a straight line from the (0,0) point through all of the points you graphed in a straight line, you have direct variation.
On the back, remember, just divide the y by the x and that is your constant of variation. Put that number in for k in your direct variation equation: y=kx
So, if you have x = 10, y = 120, then you would divide 120 by 10 to get 12. Then, put that where the k is: y=12x
That's it!
See you tomorrow!
Mrs. Swickey
