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CAT 2025 » CAT Study Material » Quantitative Ability (Mathematics) » Linear Equations
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Linear Equations

In this article, we will understand linear equations, it’s standard form, formula and how to solve linear equations along with some examples.

Table of Content
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A linear equation in one variable has the conventional form Ax + B = 0. In this equation, x is a variable, A is a coefficient, and B is constant. The typical form of a linear equation with two variables is of the type Ax + By = C. The variables x and y are variables, the coefficients A and B are coefficients, and the constant C is a constant. A linear equation is an equation with a maximum degree of 1. This signifies that no variable in a linear equation has an exponent bigger than 1 The graph of a linear equation is always a straight line.

The linear equation is an algebraic equation in which each term has an exponent of one(1) and results in a straight line when graphed. This is why it is called a ‘linear equation.’ There are one-variable linear equations and two-variable linear equations.

Linear Equation Formula:

 The linear equation can be written by using the linear equation formula. A linear equation can be written in standard form, slope-intercept form, or point-slope form, for example. Let’s look at a linear equation in its conventional form. We can see that it fluctuates depending on the number of variables, and it’s important to remember that all variables in the equation should have the highest (and only) degree of 1.

Linear Equations in Standard Form: 

Ax + B = 0 is the standard or general form of linear equations in one variable, where A and B are real values and x is the single variable. Ax + By = C is the conventional form of a two-variable linear equation, where A, B, and C are any real numbers, and x and y are the variables.

Linear Equations in One Variable: 

A one-variable linear equation is one in which only one variable is present. It has the formula Ax + B = 0, with A and B being any two real numbers and x being an unknown variable with just one solution. It’s the most straightforward approach to express a mathematical statement. The degree of this equation is always equal to 1. 

Linear Equations in Two Variables:

 Ax + By + C = 0 is a two-variable linear equation in which A, B, and C are real integers, and x and y are the two variables, each with a degree of 1. The simultaneous linear equations are two linear equations which have the same solution. Methods for solving linear equations in two variables include the graphical approach, substitution method, cross multiplication method, elimination method, and determinant method.

How to solve Linear Equations?

An equation is a weighing balance with equal weights on both sides. It still holds true if we add or subtract the same integer from both sides of an equation. It is also correct to multiply or divide the same integer on both sides of an equation. By moving the variables to one side of the equation and the constant to the other, we can get the value of the unknown variable. This is how you solve a linear equation with one variable.

Point to Remember:

• A linear equation’s solution or root is the value of the variable that makes the equation valid.

• The answer stays unaltered when the same integer is added, subtracted, multiplied, or divided into both sides of a linear equation.

• The graph of a linear equation with one or two variables is always a straight line.

Conclusion

A linear equation can be produced by equating to zero a linear polynomial over some field, from which the coefficients are chosen. The results of an equation are the quantities that, when substituted for the unknown, make the equally valid.

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Frequently Asked Questions

Get answers to the most common queries related to the CAT Examination Preparation.

Write down the definition of a linear equation? Use an example to explain.

Ans: A linear equation is one in which the greatest power of the variable is always 1. When plotted on a graph, this...Read full

What makes a linear equation linear?

Ans: A linear equation is called linear because the graph of the provided linear equation is a straight line....Read full

Can Fractions be used in Linear Equations?

Ans: Yes, fractions can be used in linear equations as long as the denominator in the fractional section is constant...Read full

What is the difference between quadratic and linear equations?

Ans: In any term of a linear equation, the exponent is always 1. Ax + By + C = 0 is the generic form of a linear equ...Read full

What is the Linear Equation Formula?

Ans: The way a linear equation is represented is called the formula. It can be stated in three different ways: stand...Read full

Ans: A linear equation is one in which the greatest power of the variable is always 1. When plotted on a graph, this equation always yields a straight line. This is why it is called a ‘linear equation.’ Linear equations exist in one variable, two variables, three variables, and so on. A linear equation in one variable is written in the usual form Ax + B = 0.

Ans: A linear equation is called linear because the graph of the provided linear equation is a straight line.

Ans: Yes, fractions can be used in linear equations as long as the denominator in the fractional section is constant. In any linear equation, their variables can’t be in the denominator of any fraction.

Ans: In any term of a linear equation, the exponent is always 1. Ax + By + C = 0 is the generic form of a linear equation, where A, B, and C are any real numbers, and x and y are the variables. Quadratic equations, on the other hand, have at least one term containing a variable raised to the second power. A quadratic equation is written in its general form as ax2 + bx + c = 0. Another distinction between the two types of equations is that a linear equation results in a straight line on the graph, but a quadratic equation results in a parabola.

Ans: The way a linear equation is represented is called the formula. It can be stated in three different ways: standard, slope-intercept, and point-slope. A linear equation in one variable is written in the usual form Ax + B = 0. x is the variable, A is the x coefficient, and B is the constant. A linear equation of two variables can be written in the conventional form: Ax + By = C. A, B, and C are any real numbers, and x and y are variables.

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