Opposite Operations.

Katie & Keerat.

Opposite operations- When you're trying to get a variable by itself. In other words, move the variable across the equal sign and match with the following:
Divide = Multiply
Multiply = Divide
Subtract = Add
Add = Subtract


Examples:
1)4y-2=18 3)5k-2=28
4y-2 +2= 18+2 5k-2+2=28+2
4y= 20 5k=30
4y/4 = 20/4 5k/5=30/5
y= 5 k=6


2)4x+7= 23
4x+7-7= 23-7
4x= 16
4x/4=16/4
x=4
PRACTICE FOR YOU ! Write on seperate piece of paper.
1)2z+3=17
2)10p-20=30
3)5t+3=18
4)6y+2=14
Helpful videos ! :)
http://www.youtube.com/watch?v=zwCEuvDKcXY
http://www.youtube.com/watch?v=26jymb8DT14
http://www.youtube.com/watch?v=QcG-jek6aoE&feature=related