Keelen, Stevie, Nic, and Marissa,
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Transcript of Keelen, Stevie, Nic, and Marissa,
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Keelen,
Stevie,
Nic, and
Marissa,
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This yellow tile represents a POSITIVE one.
This red tile represents a NEGATIVE one.
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This is also a MYSTERY NUMBER, but it is a negative X.
This is a MYSTERY NUMBER. Since we don’t know the value of it, it is called X.
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Additive Inverse: A pair of numbers or expressions to a sum of zero.
Example: If Johnny had one apple, and Bobby took it away, Johnny has ZERO apples.
That process is called ZEROING OUT.
Therefore, if you have a positive One Square and subtract One square Square, ,(or add a negative that equals the same value.)
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This line means the equal sign (=)
You put tiles on both sides of the boxes. They represent an equation.
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This Means:
This is a POSITIVE 2x
This is just a POSTIVE 2.
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There is a NEGATIVE X in this box, plus the Negative 1.
This means it’s a Positive 2X minus a Negative 1
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We now have to find out what X means in an equation.
If the equation is:
Take away 5, or add a negative 5 (-5), on both sides to ZERO OUT.
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Now you can see that in the boxes, there are 3 different groups with one in each group so equals 5!
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When “X” is on both sides of the equation………..
2x-4=x+3
In order to solve this equation you need to zero out. So, you add four to each side of the equation
to get rid of the –4.
*You always want to get rid of negatives first.
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Try this one on your own!
This is how it looks on an equation box!
Remember zeroing out and getting the x off the right side as a priority!
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Remember to ZERO OUT all of the X’s first, then the NUMBERS!
Now how did we figure that out?
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This equation will NOT be able to split into even groups. So, we take a different route.
We start this equation by subtracting or adding a negative X to each side because of the X on the right. Then you begin zeroing out: X-4 by adding 4 to each side of the box.
![Page 17: Keelen, Stevie, Nic, and Marissa,](https://reader036.fdocuments.us/reader036/viewer/2022062408/568138ef550346895da0a451/html5/thumbnails/17.jpg)
The dotted line shows that there are TWO groups of 2x+4
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Now how will you ever be sure that your answer is
right?
Next slide….
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Here’s an even equation!
Remember to use additive inverse when trying to find out what X means.
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Now to zero out the X’s, you have to subtract an X from each side, to make sure that only one X is left on one side.
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We zeroed out the X=
Then, since the X is multiplied by two, you divide both sides by two to zero the 2X out..
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