BECE Mathematics 2021 Paper

Concept:An inequality is solved like an equation, but the inequality sign reverses when multiplying or dividing by a negative number.Explanation:Start with $\frac{1-x}{3} < 4$.Multiply both sides by 3, which is positive, so the inequality direction stays the same:$1 - x < 12$.Subtract 1 from both sides:$-x < 11$.Divide both sides by $-1$. Since we are dividing by a negative number, reverse the inequality sign:$x > -11$.Answer:$x > -11$, so the correct option is B.