Chapter I : Linear Equations in two variables in two variables

Example 6: Solve for x and y:

Solution: putting x + y =u and x - y = v the given equation reduces to

Multiplying equation (1) by 4 and equation (2) by 3 we get

Subtracting (4) from (3) we get

11/u = 1

Or, u = 11

Or,

Putting u = 11 in (1) we get

Or,

Adding (5) and (6) we get

2x = 16

x = 8

Putting x = 8 in (5) we get

8 + y = 11

y = 3

 

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Subjects Maths (Part-1) by Mr. M. P. Keshari
Chapter 1 Linear Equations in Two Variables
Chapter 2 HCF and LCM
Chapter 3 Rational Expression
Chapter 4 Quadratic Equations
Chapter 5 Arithmetic Progressions
Chapter 6 Instalments
Chapter 7 Income Tax
Chapter 8 Similar Triangles