r1:x-3*y+2*z=0;

linsolve([r1],[x,y,z]);

load(draw)$

draw3d(xaxis=true,yaxis=true,zaxis=true,axis_3d=true,color=red,implicit(r1,x,-10,10,y,-10,10,z,-10,10));

r2:x-3*y+2*z=3;

linsolve([r2],[x,y,z]);

draw3d(xaxis=true,yaxis=true,zaxis=true,color=blue,implicit(r2,x,-10,10,y,-10,10,z,-10,10));

draw3d(surface_hide=true,xaxis=true,yaxis=true,zaxis=true,color=red,implicit(r1,x,-10,10,y,-10,10,z,-10,10),color=blue,implicit(r2,x,-10,10,y,-10,10,z,-10,10));