The area in the inequality gives you choices. Like the number of pounds that an elevator can carry is anything less than its maximum.
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Infinite.
Inequalities tend to have infinitely many solutions.
A solution to a linear inequality in two variables is an ordered pair (x, y) that makes the inequality a true statement. The solution set is the set of all solutions to the inequality. The solution set to an inequality in two variables is typically a region in the xy-plane, which means that there are infinitely many solutions. Sometimes a solution set must satisfy two inequalities in a system of linear inequalities in two variables. If it does not satisfy both inequalities then it is not a solution.
None. -42 is a single integer, not an equation nor an inequality. So there are no solutions.
They can have none, one or infinitely many.