10. Solve

2x + 3y + z = 10

x - y + z = 4

4x - y - 5z = -8

using graphing.

The graph looks like

We can see that the three graphs, which will all be planes, will intersect at a single point. However, not only is it somewhat challenging to draw the graphs, but they are not always easily read. It would be useful to develop computational methods.