Answer:
Ummm I think the question is wrong, I don't fully understand.
I think its false , he created the telephone
If we use the last equation:
2 x = 18
x = 18 : 2
x = 9
Then we will put it in another equation:
x - 2 y = 3
9 - 2 y = 3
- 2 y = 3 - 9
- 2 y = -6
y = -9 : ( -3 )
y = 3.
The solution is : D ) ( 9, 3 )
