To Make A Line Graph With Specific Increments On Both The X And Y Axis

I'm trying to make a line graph with specific increments on both the x and y axis. Now, I can make specific increments on one, but have to sacrifice the other in order for me to label the lines. Im not sure how to get around this. I'll just type out what i'm trying to do and maybe you smart people can help me here.

Okay, both the x and y axis must be in increments of 8,10,12.5,16,20,25,30, and 35.

The first line should be labeled "Indicated magnification, and should have the values 8,10,12.5,16,20,25,30, and 35... the same as the x and y values, making the line a straight linear line.

The second line should say "actual m value" and have values of 10,12.5,15.5,20.5,25,31,37.5, and 44.

The third line should say "actual n value" and have values of 10,13,16,21,26,32,38.5, and 45.