Firstly, write the equation as a function machine. Then, find the inverse of each step. This means turning multiplications into divisions and subtractions into additions.

Chemical reactions can be represented by word equations. Learn more in this KS3 Chemistry guide from Bitesize.

About Class 9 Maths Chapter 4 Linear Equations in Two Variables In this chapter, you will get to learn about linear equations and their applications in real life problems.