Question

Please answer this question !! Thank u ! Will give brainliest !!

Answer 1

Answer: B

Step-by-step explanation:

You can tell which linear system has (1, 1) as its solution by plugging in (1, 1) into each equation.

A. Incorrect

3(1)+2(1)=3

3+2=3

5≠3

B. Correct

7(1)+2(1)=9

7+2=9

9=9

2(1)+7(1)=9

2+7=9

9=9

C. Incorrect

8(1)+1=7

8+1=7

9≠7

D. Incorrect

8(1)-2(1)=4

8-2=4

6≠4

Therefore, B is the correct answer.

Answer 2

Answer: B

Step-by-step explanation: The answer is B because in the equation 7x + 2y = 9 and 2x + 7y = 9 all u have to do it replace y by 1 and x by 1 as well since the question states (1, 1) are the solution coordinates... So,

7(1) + 2(1) = 9

That is correct

2(1) + 7(1) = 9

That is also correct

So the answer is B