Hello. I don't really understand all the details of your problem, so I'm going from just your diagram.
Make (x,y) = (0,0) the lower right corner of the grid of horizontal and vertical lines, with y being the numbers at the far left and x being the negative of the numbers at the top. So the upper right corner is (x,y) = (-25,5).
It looks like the line sloping up has a slope of 1/5 and goes through (0,0). The lower line slopiing down has a slope of -1/5 and goes through (-1,1).
Using the following formula for a line:
the equations of the two lines are y = 0.2x and y = -0.2x +0.8
and solving for x and y gives x=2 and y=0.4. So the first answer is the distance from (-1,1) to (2,0.4).
You can follow a similar procedure for the second line.
Hopefully that solves your problem.
Post again if you need more help.