Respuesta :

the other half is 9.
(?, 5)  on 4x - 7y = 1.

4x - 7y = 1          ? =x,  y = 5

4x - 7*5 = 1

4x - 35 = 1

4x = 1 + 35 = 36

4x = 36

x = 36/4

x = 9

The other half of the coordinate is 9.

So (?, 5) is   (9 , 5).