Simultaneous equations like 𝒚 = 2𝒙 - 1 and 𝒚 = 𝒙 + 1 can be represented graphically. To solve the equations graphically, the two lines 𝒚 = 𝒙 + 1 and 𝒚 = 2𝒙 - 1 are drawn on the same diagram.
How can you have a proof without proving anything? Mathematicians found a way and, in the process, came to blows over it – ...
This requires an algorithm: students are taught to stack one number atop another and multiply each digit of the bottom number ...