tentukan himpunan persamaan linier dua variabel dari 3(x+2)-y-7=0 dan 3(x+2)+(Y+3)=5

3(x+2)-y-7 = 0
3(x+2)+(y+3) = 5
-------------------------
3x+6-y-7 = 0
3x+6+y+3 = 5
-------------------------
3x-y = 1
3x+y = -1
---------------------(ditambah)
6x = 0
x = 0

3x-y = 1
3(0)-y = 1
-y = 1
y = -1

HP : {0,-1}