Verified Answer :

Hagrid

The answer is 3. Just substitute the x coordinate to the
equation of the line, which is 4x-5y=-7. So in substituting 2 to x, you’ll have
a working equation of 4(2)-5y=-7. Isolate y which will give you y=-7-8/-5. The
value that you’ll get would be 3. 

Neuron

If you would like to find the other half of the coordinate, you can calculate this using the following steps:

(x, y) = (2, ?)
x = 2
y = ?

4 x - 5 y = - 7
4 2 - 5 y = - 7
8 - 5 y = - 7
8 + 7 = 5 y
15 = 5 * y      /5
y = 15 / 5
y = 3

The correct result would be y = 3.