Algebra is a branch of Mathematics which uses letters of the alphabet to find unknown numbers. These letters are called variables. The values that are known in the given expression such as numbers are called constants. Algebra plays a vital role in the mathematics section of SSC CGL and CHSL. It is important because it helps you not just in solving questions in the exams, but also in answering many of your day-to-day life problems. Algebra is an important topic that carries a lot of marks. In SSC CGL tier-1 and CHSL tier-1 the weightage of Algebra is 2-3 questions and, in tier-2 exams, the weightage is 10 - 12 questions. Let us discuss some important models in Algebra.