Question

The solution x = 1 and y = -1 satisfies which of the following equations​

Answer 1

Answer:

Correct option is

B

x+y=2

D

x+2y=3

(A) 2x+y=4

Put the value x=1 and y=1 we get

2×1+1×1=2+1=3



=4

Then x=1 and y=1 is not the solution

(B) x+y=2

Put the value x=1 and y=1 we get

1×1+1×1=2=4

It satisfies 2

Then x=1 and y=1 is the solution

(C) x−y=1

1×1−1×1=1

1−1=0



=1

Not satisfies

Then x=1 and y=1 is not the solution

(D) x+2y=3

Put the value x=1 and y=1 we get

1×1+2×1=1+2=3=3

Then x=1 and y=1 is the solution

Thus, equation in (B) and (D) has their solution x=1 and y=1