Concerns about the use of technology in math class are nothing new. Calculators, the internet, and smartphones have each raised alarms that they would short-circuit students’ math learning. Who knows, ...

The teaching and learning of linear algebra have evolved significantly over recent decades, underpinned by diverse approaches ranging from theoretical expositions to dynamic, model-based environments.

She’s right—using simultaneous equations does get really complicated, and if you’d like to send me your work for the solution, I’d love to see it. But the system is also kind of a trick. Like a sudoku ...