Section 7.4 (Continued)
Which method should we use?
1.Graphing - never
2.Substitution - when we have a variable by itself
3.Elimination - when we should not use substitution Make sure the variables are lined up
Example: What method should we use???
2x-3=y Use substitution
2x+3y=-1
Which method should we use?
1.Graphing - never
2.Substitution - when we have a variable by itself
3.Elimination - when we should not use substitution
Make sure the variables are lined up
Example: What method should we use???
2x-3=y Use substitution
2x+3y=-1