[br]a := -2[br][br]Solve[a*x < 6, x][br][br][br][br]Try changing [i][b]a[/b][/i] with a slider
What happens to the solution when a becomes negative?[br][br]How does this illustrate the [b]rule[/b] about multiplying/dividing by negatives?
[br][br][br][br][br][br][br][br][br][br][b]Try using different numeric values for [i]a[/i] and [i]b[/i], and switch order.[/b][br]
Explain how [b]sign and domain[/b] interact in rational expressions.