8. 4j -2j -5k +3k (combine like terms)
2j -2k
B
9. -6m+4m +2n-3n
-2m-1n
D
10. ( 2x-1) + (3x-1) +(3x-1)
2x+3x+3x -1-1-1
8x-3
D
This represents an increase of 50%
You have to analyze the problem, to find out what is the dependent variable, which is y. Also, what unit is the independent variable which is x.
All you need to do is draw the picture of what is happening
