# Revision history [back]

### What does r in an answer mean

After I ran the following I got a valid image but what do the r's stand for in the solve part? They don't seem to have a value but I didn't get an error.

var('x y') show(plot3d(x^2 + y^2, (x,-2,2), (y,-2,2))) [image]

solve(x^2 + y^2==0,[x,y]) [[x == r1, y == Ir1], [x == r2, y == -Ir2]]

### What does r in an answer mean

After I ran the following I got a valid image but what do the r's stand for in the solve part? They don't seem to have a value but I didn't get an error.

var('x y') show(plot3d(x^2 + y^2, (x,-2,2), (y,-2,2))) (y,-2,2)))

[image]

solve(x^2 + y^2==0,[x,y]) [[x == r1, y == Ir1], [x == r2, y == -Ir2]]

### What does r in an answer mean

After I ran the following I got a valid image but what do the r's stand for in the solve part? They don't seem to have a value but I didn't get an error.

var('x y') show(plot3d(x^2 + y^2, (x,-2,2), (y,-2,2)))

[image]

solve(x^2 + y^2==0,[x,y]) y^2==0,[x,y])

[[x == r1, y == Ir1], [x == r2, y == -Ir2]]

### What does r in an answer mean

After I ran the following I got a valid image but what do the r's stand for in the solve part? They don't seem to have a value but I didn't get an error.

var('x y') show(plot3d(x^2 + y^2, (x,-2,2), (y,-2,2)))

[image]

solve(x^2 + y^2==0,[x,y])

[[x == r1, y == Ir1], [x == r2, y == -Ir2]]

 5 None slelievre 17634 ●22 ●159 ●348 http://carva.org/samue...

### What does r in an answer mean

After I ran the following I got a valid image but what do the r's r's stand for in the solve part? They don't seem to have a value value but I didn't get an error.

var('x y')
show(plot3d(x^2 + y^2, (x,-2,2), (y,-2,2)))(y,-2,2)))


[image]

solve(x^2 + y^2==0,[x,y]) y^2==0,[x,y])
[[x == r1, y == Ir1], I*r1], [x == r2, y == -Ir2]]-I*r2]]