Question

x+7y=10;,3x-2y=7 hindi​

Answer 1

• x + 7y = 10

• 3x - 2y = 7

__________ [ दिया हुआ ]

• हमें x और y का मान ज्ञात करना होगा।

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• x + 7y = 10

=> x = 10 - 7y _______ (समीकरण 1)

• 3x - 2y = 7

=> 3(10 - 7y) - 2y = 7

=> 30 - 21y - 2y = 7

=> - 23y = 7 - 30

=> - 23y = - 23

=> 23y = 23

=> y = 1

(समीकरण 1) में y का मान रखो

=> x = 10 - 7(1)

=> x = 10 - 7

=> x = 3

______________________________

$\textbf{x = 3 और y = 1}$

__________ [ उत्तर ]

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✡ सत्यापन :-

x + 7y = 10

ऊपर की गणनाओं से हमें x = 3 और y = 1 मिलता है |

3 + 7(1) = 10

3 + 7 = 10

10 = 10

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Answer 2

Answer:

x + 7y = 10; .....(I)

3x – 2y = 7 .....(II)

Multiplying (I) with 3

3x + 21y = 30; .....(III)

3x – 2y = 7 .....(IV)

Subtracting (IV) from (III) we get

23y = 23

⇒y = 1

Putting the value of y in (IV) we get

3x – 2 = 7

⇒3x = 7 + 2 = 9

⇒3x = 9

⇒x = 3

Thus, (x, y) = (3, 1)