2018-09-10 00:20:35 -0600 commented answer Plotting systems of linear equations with 3 variables Hello, You are correct. In my mind, I was looking for 3 lines, but mathematically those equations produce planes. Maybe I was trying to relate to 2 variable linear equations Please excuse my ignorance. Thank you, Steve. 2018-09-06 23:13:37 -0600 commented answer Plotting systems of linear equations with 3 variables Thank you for your patience and help. The goal is to create and image like the one at this link ( 3d Image so I can show a classroom of middle school and/or high school students what the solution to a system of linear equations that has 3 variables looks like. This abstraction can be very hard for students and me too. 2018-09-06 01:14:42 -0600 commented answer Plotting systems of linear equations with 3 variables Hello, Thank you for responding. Can you point me to a resource that shows how to create a list of points. And then another resource that shows how to plot with point3d(L)? I use SageCell. Thank you. 2018-09-06 00:58:43 -0600 commented answer Plotting systems of linear equations with 3 variables Hello, Thank you. That helped. What I was hoping to do was to have 3 distinct lines (or curves) rather than planes. The code did work though. I'm not familiar with viewers. x, y, z = SR.var('x y z') a, b, c = [2*x + 3*y - z == 15, x - 3*y + 3*z == -4, 4*x - 3*y - z == 19] xx = (x, -10, 10) yy = (y, -10, 10) zz = (z, -10, 10) pa = implicit_plot3d(a, xx, yy, zz, color='blue', alpha=0.3) pb = implicit_plot3d(b, xx, yy, zz, color='red', alpha=0.3) pc = implicit_plot3d(c, xx, yy, zz, color='green', alpha=0.3) p = a + b + c show(pa + pb + pc)  2018-09-05 02:08:16 -0600 asked a question Plotting systems of linear equations with 3 variables Hello, Is there a way to plot these 3 equations in 3d space that would show them intersecting? 2x + 3y - z = 15, x - 3y + 3z = -4, 4x - 3y - z = 19, I can get the numerical answers, but I'd love to be able to show a graphical representation to students and myself. Thank you, Steve. Here is the code for the numerical answers: # 2*x + 3*y - z == 1 # x - 3y + 3z == - 4 # 4*x -3*y- z == 19 var('x,y,z') words = solve([2*x + 3*y - z == 15, x - 3*y + 3*z == - 4,4*x -3*y- z == 19],x,y,z) words  2018-06-05 23:31:59 -0600 received badge ● Student (source) 2018-06-05 21:57:01 -0600 commented answer Putting the results of a function as text into a plot Thank you very much. I really appreciate your help! 2018-06-05 07:56:56 -0600 asked a question Putting the results of a function as text into a plot How can I put the results of functions into a plot? I can't find any examples. f(x) = x/33.82 plotEquation = plot(f(x), -1, 70) equationDifferential = f.diff()(x) big_image = plotEquation # big_image = plotEquation + SOME CODE THAT PUTS THE RESULT OF f.diff()(x) in the plot. big_image.show()