873 Math Blog

Today in class we started on the 2 step equations.
On the inside of the blue, we wrote 2n+1=5.

You isolate the variable (2n)
Cancel constant (+1)
Balance
Cancel multiply (2n)
Balance
VERIFY

There are 2 cancellations.

You cancel the constant first. You get rid of the +1 with a -1.

2n+1=5
-1 -1
2n=4

You get rid of the variable second. You get rid of the times 2 with a divide by 2. n=2 After that, you verify.

-2n+1=5
-2(2)+1=5
4+1=5
-5=5

You don't need all 4 lines. Only the parts in blue.

After that, we went on to the next page on the front. We wrote 3n+4=19. We solved it 2 ways. The first way was the same with the last question. The other way, we just did the cancelling on the other side.

3n+4=19-4/3
n=15/3
n=5

The verifying is the same as the other way. After that, we switched to the 'equations' side (the front-right-bottom side) of the green where you draw the pictures. This is what we wrote.

After that, we went to the back of the bottom-left green part and solved -2n+3=9 both ways. We went back to the other part of green (the bottom-right-back) and drew this.

Our homework was in the purple booklet. Page 43, the multiplying questions only. I choose Zerlina to do the next scribe.