Question

If 7x+6y=40 and 6x+7y=38 , then what is the value of (x-y)​

Answer 1

Answer:

2

Step-by-step explanation:

2 is the right answer of this question.

Answer 2

Answer:

2

Step-by-step explanation:

7x+6y=40--------(1)

6x+7y=38---------(2)

multiply by 6 in(1) and by 7 in(2) and subtract each other we get

42x+36y=240

42x+49y=266

- - -

____________

-13y = -26

y= -26/-13=2

put the value of y in the (1) we get

7x+6*2=40

7x+12=40

7x=40-12

7x=28

x=28/7=4

Now the value of (x-y)

(4-2)

=2

I think it is helpful for you