Answer:
Explanation:
3x - 7y = 21
6x = 14y + 42
Or 6x - 14y = 42
3x - 7y = 21 (1)
6x - 14y = 42 (2)
———————
-2(3x - 7y = 21)
6x - 14y = 42
———————
-6x + 14y = -42
6x - 14y = 42
———————
0x + 0y = 0
So I think in this case x and y has infinitely many solution