Incorrect graph structure

edit

Getting the same scale for the x and y axes is achieved using aspect_ratio.

Getting an outer box is achieved using frame. The ticks will be on the box though.

Not sure how to get the labels on the min side of the axes...

The following is maybe already a step closer to your desired output.

h = plot(x, (x, -73.83, 73.83), linestyle="--")
g = plot(-0.7350*x + 67, (x, -73.83, 73.83), linestyle="--")
p = [(11.13, 58.82), (4.99, 10.03), (17.24, 42.79), (23.80, -73.83), (57.84, -37.82)]
r = list_plot(p, axes_labels=['(+) GE', '(+) CE'])
r += text('A CMSCI = 0.131', (11.135, 58.82))
H = h + g + r
H.show(aspect_ratio=1, frame=True, ymin= -73.83, ymax=73.83)

See the possible options to show in the documentation, either by typing H.show? after defining H as above, or online at:

• https://doc.sagemath.org/html/en/reference/plotting/sage/plot/graphics.html#sage.plot.graphics.Graphics.show