Sage 2D plot

var('x y')
p=plot((x-1)/(x+2),(-5,1), color='red')
xmin=-5
xmax=1
ymin=-10
ymax=10
p.show(axes=True, xmin=xmin, xmax=xmax, ymin=ymin, ymax=ymax)

Add XY axis to MatLab 2D plot

%%

syms x y;
ezplot((x-1)/(x+2));

% Add xy axis to above function plot.

% line([x1 ; x2],[y1 ; y2])

% where line goes from (x1,y1) to (x2,y2)

line([-10 ; 10],[0 ; 0], 'color', 'black', 'LineStyle',':')
line([0 ; 0],[-10 ; 10], 'color', 'black', 'LineStyle',':')