Question

(2) x + 7y = 10; 3x - 2y = 7​

Answer 1

Answer:

Step-by-step explanation:

x+7y=10(multiply by 3)

3x-2y=7

which comes out to be

3x+21y=30

3x-2y=7 subtracting

23y=23

y=1

putting the value of y in one of the equations

3x-2(1)=7

3x=9

x=3

therefore x=3 and y =1

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)