Question

7a +13b = 27 ; 13a + 7 b= 33 equation​

Answer 1

Answer:

Correct option is

A

3

7x+13y=27....(i)

13x+7y=33....(ii)

Multiplying by 13 and 7 in equation (i) and (ii) respectively, we get

91x+169y=351

−

9

1x

−

+

49y=

−

2

31

120y=120

y=1

Put the value of y in equation (i), we get

7x+13×1=27

⇒7x=27−13

⇒7x=14

⇒x=2

Then x+y=2+1=3.