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2x+5y=-1,3x-y=7

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2x+5y=-1,3x-y=7

Posted by Gurrala Rishitha Reddy 5 years, 4 months ago

CBSE > Class 07 > Mathematics

2 answers

Ananth Dev 5 years, 4 months ago

Hence, the required solution be x = 2 and y = - 1

0Thank You

Gaurav Seth 5 years, 4 months ago

Here, the given equations are

3x - y = 7 ...(i)

2x + 5y = - 1 ...(ii)

Now, multiplying (i) by 5 and (ii) by (-1), we get

15x - 5y = 35

- 2x - 5y = 1

On subtraction, we get

17x = 34

⇒ x = 34/17

⇒ x = 2

Now, putting x = 2 in (i), we get

3 (2) - y = 7

⇒ 6 - y = 7

⇒ y = 6 - 7

⇒ y = - 1

Hence, the required solution be

x = 2 and y = - 1

Hence, given pair of linear equations has a unique solution.

0Thank You

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Posted by Shree Vanshika Reddy Reddy 3 months ago

CBSE > Class 07 > Mathematics