Question
Substitution 3x+2y=21 2x+4y=22
Answers
oobleck
3x+2y = 21 ... double that to get
6x+4y = 42
2x+4y = 22
subtract to get
4x = 20
Now finish it off.
6x+4y = 42
2x+4y = 22
subtract to get
4x = 20
Now finish it off.