10. 2x + 7y = 1
2x - 4y = 12
solve for y

The solution for y = -1.

Step-by-step explanation:

Given:

   ....(1)

 ....(2)

So, to solve for y, first we solve for x in equation (2):

⇒

Dividing both sides by 2,

⇒            

Now, substituting the value of x  in equation (1):

⇒

⇒

⇒

⇒

⇒

Dividing both sides by 11,

⇒

Therefore, the solution for y = -1.

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step-by-step explanation: