👉 In mathematics, a constraint is a condition that limits or restricts the possible values of variables in an expression. Constraints can be applied to both linear and nonlinear equations, allowing for restrictions on the values that can be assigned to variables. For example, consider the equation y = 2x + 3. In this case, there are two constraints: x cannot equal zero (the solution is not valid when x = 0) and y must be greater than or equal to 1 (the