Question

27 x + 31y = 85 ;31 x + 27 y = 89.​

Answer 1

Step-by-step explanation:

what do we have to find?????

Answer 2

Step-by-step explanation:

27x+31y=85.......(1)

31x+27y=89.......(2)

adding equation 1 and 2

27x+31y=85

+

31x+27y=89

___________

58x+58y=174

dividing both sides by 58,

x+y=3.......(3)

now,subtract equation 1 from 2

31x+27y=89

-

27x+31 =85

___________

4x-4y=4

dividing both sides by 4

x-y=1.......(4)

adding equation 3 and 4

x+y=3

+

x-y=1

______

2x=4

x=2

put, x=2 in equation 3

x+y=3

(2)+y=3

y=3-2

y=1