# Problem Solving Using Linear Equations

In this case both equations have "y" so let's try subtracting the whole second equation from the first: So now we know the lines cross at x=1.

Let’s now move on to an example and I will illustrate you how to use these steps to formulate linear equations. So, we use x for tens place and y for units place and as given x y = 7 Also, it’s been provided in the question that when we swap the digits of original the no. if x is on tens place and y on units place then the original no. Since, Linear equations has wide range of application such as problem on ages, numbers, time, speed and distance problems, Time-work problems, Functions, Arithmetic Progression etc.

Consider this, The sum of digits of two-digit number is 7. Let’s read the question several times and note down all the key points and translate them into mathematical equations. would be 10x 1y And if we swap the digits then y will be now at tens place and x at units but the new no. This means, 10x 1y = 10y 1x – 27 We are left we 2 equations and 2 unknown we can solve it using elimination method. In fact, it can be used anywhere where a relationship is defined for some unknown value and our aim is evaluate those parameters we can make use of it.

A table will help you to organize the information and to write the equations. Ten years from now, Orlando will be three times older than he is today.

This is shown in the examples involving more than one person.

Numerical: The ratio between the present ages of A and B is 5:3.

The ratio between A’s age 4 years ago and B’s age 4 years hence is 1:1.

You can also see:- Basic Probability Concepts for CAT Preparation Games and Tournaments for CAT Exam Logical Reasoning – Part 1 How to solve logical reasoning problems based on team selection and group formation?

How to solve Logical Reasoning questions based on Ranking and Ordering Logical Reasoning Basics – How to solve coin picking / matchstick related problems?

Now, Problem on ages can be categorized into three types, i.e.

Questions based on calculating the present age, Questions to determine the age of person after k years and questions that calculate age of a person before k years.

## Comments Problem Solving Using Linear Equations

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