The "y=mx+c to Success" series of Mathematics books is tailored to cover the syllabus of the Cambridge international school system with the Grade 9 textbook specifically designed for the Cambridge Lower Secondary level. This textbook serves as a continuation from Grade 8 aiming to reinforce and expand upon the acquired concepts and knowledge. Focused on delving deeper into the rules of mathematical concepts the primary objective is to foster a more profound understanding. The content includes abundant Examples with Try Now exercises and general Exercises that are incorporated throughout the textbook that providing ample opportunities for students to practice these rules. The acquisition and comprehension of these mathematical principles are deemed crucial for establishing a robust foundation that will prove beneficial in future mathematical pursuits.