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Solve for x and y: 4x = 17 - x-y8 2y + x = 2 + 5y+23 - Mathematics

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Question

Solve for x and y:

4x = 17 - `[ x - y ]/8`

2y + x = 2 + `[ 5y + 2 ]/3`

Sum

Solution

The given pair of linear equations are

4x = 17 - `[ x - y ]/8`

⇒ 33x - y = 136                   ...(1) [On Simplifying]

2y + x = 2 + `[ 5y + 2 ]/3`

⇒ 3x + y = 8                     ...(2) [On Simplifying]

Multiply equation (2) by 11, we get,

33x + 11y = 88                   ...(3)

Subtracting equation (1) from (3)

   33x + 11y = 88
33x - y = 136    
     -    +      -         
12y = - 48

y = -4

Substituting y = -4 in equation (1), we get:

33x - (-4) = 136

⇒ 33x = 132

⇒ x = 4

∴ Solution is x = 4 and y = - 4.

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Methods of Solving Simultaneous Linear Equations by Elimination Method - Method of Elimination by Equating Coefficients
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Chapter 6: Simultaneous (Linear) Equations (Including Problems) - Exercise 6 (B) [Page 81]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 6 Simultaneous (Linear) Equations (Including Problems)
Exercise 6 (B) | Q 13.2 | Page 81
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