Question

3x-y=3
7x+2y=20 By substitution method

Answer 1

Answer:

3x-y=3

-y=3-3x

Taking - common

y=3x-3....(1)

use eq.(1) in 7x+2y=20

7x+2(3x-3)=20

7x+6x-6=20

13x=26

x=26/13

x=2(put dis value in eq.1)

y=3(2)-3

y=6-3

Y=3

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#SHANAYA

Answer 2

Answer:

We have,

3x – y = 3 ….(1)

7x + 2y = 20 ….(2)

From equation (1), we get ;

3x – y = 3 ⇒ y = 3x – 3

Substituting the value of ‘y’ in equation (2), we get

⇒ 7x + 2 × (3x – 3) = 20

⇒ 7x + 6x – 6 = 20

⇒ 13x = 26 ⇒ x = 2

Now, substituting x = 2 in equation (1), we get;

3 × 2 – y = 3

⇒ y = 3

Hence, x = 2, y = 3

Explanation: