> f1:= x -> 2*x + 1;

> g1:= x -> .5 * ( x - 1);

> a1:= plot(f1(x), x = -10..10, thickness=2, color = black):

> b1:= plot(g1(x), x = -10..10, thickness=2, color = red):

> c1:= plot(x, x = -10..10, thickness=2, color = blue):

> d1:= textplot([2,10,`f1`], thickness=2, color = magenta):

> e1:= textplot([7,10,`y=x`], thickness=2, color = magenta):

> h1:= textplot([3,-3,`g1`], thickness=2, color = magenta):

> display({a1,b1,c1,d1,e1,h1});