Question 748605
5x -  y =  7 ....1
 x - 7y = -2 ....2
Multiply (2) by -5

 5x - y   =  7
-5x + 35y = 10

Add together

      34y = 17
        y = 17/34 or 1/2
Substitute y = 1/2 in (1)

  5x - 1/2 = 7
        5x = 7 + 1/2
        5x = 15/2
         x = 15/10 or 3/2

        {3/2, 1/2}