This blog notes down all key concepts and properties to remember to be able to solve problems related to GMAT linear and quadratic equations. Many GMAT Data Sufficiency & GMAT Problem Solving questions need basic know-how and knowledge of properties so we can infer if sufficient information is available or not.

This section needs to be revised at least once. Before we delve into quadratic equations, we will take a look at the basic linear equations.

## Linear Equations

The most basic equation is of the form y = mx + c. Herein, m is the slope and c is the intercept for the equation. We have two variables here to be able to solve for the x and y. We will need at least two equations to solve for two variables.

Though in GMAT, you could solve for y = mx + c if there is additional information available such as the values of x and y being positive integers. This will eliminate any chance of them being 0 as well. Thus, this constraint can help us to be able to get the values of x and y.

The quadratic equations are equations with degree 2. So, the highest power of the variables is 2. They typically take the form of ax^2 + bx + c = 0. Where a, b, c are constants.