5Solution set

The two equations of Tina's parents do not have much to do with straight lines!

Even if you can transform them in such a way that one can draw them, this is not very descriptive in the subject context.

That's why in many tasks you don't give the solution as an intersection point, but as a solution set:

For example, if you have a system that is solved for the values $a=4$ and $b=15$, you write:

If you sort the variables alphabetically, you can also use the last and shorter notation.