Question

1] If 7x+6y=17 and 6x+7y=10, then what is the value of (x-y)?
A) 7
B] 27 C] -7 D] -27​

Answer 1

Answer:

Given

• 7x + 6y = 17 equation i)
• 6x + 7y = 10 equation ii)

Now subtract equation ii) from equation i)

(7x + 6y) - (6x + 7y) = 17 - 10

7x + 6y - 6x - 7y = 7

7x - 6x + 6y - 7y = 7

x - y = 7

So, option A) 7 is correct answer.