If the solution of ( mx+2>8 ) is (x< -3), what is the value of (m)?

Correct answer: \(-2\)

From \(mx+2>8\), we get \(mx>6\). Since the solution is \(x<-3\), \(m\) must be negative because dividing an inequality by a negative number reverses its sign. Hence the boundary value satisfies \(\frac{6}{m}=-3\), which gives \(m=-2\). If \(m=2\), the solution would be \(x>3\), so it is the closest incorrect option. Exam tip: always reverse the inequality sign when multiplying or dividing by a negative number.