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Solve the given pair of linear equations,

x/7 + y/3 = 5 

x/2 - y/9 = 6

1 Answer

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Best answer

Given:

\(\frac{x}{7} \) + \(\frac{y}{3}\)= 5 and \(\frac{x}{2}\) – \(\frac{y}{9}\)= 6 

\(\frac{3x+7y}{21}\) = 5 and \(\frac{9x-2y}{18} \) = 6 

⇒ 3x + 7y = 105 …….. (1) and 

9x – 2y = 108 …….. (2)

⇒ y = 207/23 = 9 

Substituting y = 9 in equation (1) we get 

3x + 7(9) = 105 

⇒ 3x = 105 – 63 

⇒ 3x = 42

⇒ x = 42/3 = 14 

∴ The solution (x, y) = (14, 9)

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