After completion of this chapter, students will be able to:

- solve a system of linear equations by elimination & substitution method.
- solve the problems related to indices.

Ratios are used to compare values. They tell us how much of one thing there is compared to another and Proportions are related to ratios in that they tell you when two ratios are equal to each other.

Indices are a useful way of more simply expressing large numbers. They also present us with many useful properties for manipulating them using what are called the Law of Indices.

A linear equation is an algebraic equation in which each term is either a constant or the product of a constant and (the first power of) a single variable.

Factorization is the process of expressing the given algebraic expression as the product of two or more algebraic expressions or terms.

An equation like ax2+ bx + c = 0 where a≠ 0, which contains only one variable and '2' as its highest power is called a quadratic equation. There are two values of the variable in any quadratic equation.