intermediate algebra
posted by ROCKY .
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions,state this.
3x+7y=77
2x+7y=42

Subtract equation #2 from equation # 1.
5x = 35
You should be able to take it from here. 
I understand where I should what from where plz help me out. It would really be appreciaeted.

3x(2x) = 3x+2x = 5x
7y7y = 0
7742 = 35
Therefore 5x + 0 = 35 or 5x = 35