What is the solution of the system? Use elimination.
3x + 9y = 33
–10x – 6y = –14
to eliminate y, rewrite as
6x + 18y = 66
-30x - 18y = -42
Now just ad to get
-24x = 24
x = -1
Now use that to get y = 4
3x + 9y = 33
–10x – 6y = –14
6x + 18y = 66
-30x - 18y = -42
Now just ad to get
-24x = 24
x = -1
Now use that to get y = 4