Question 445082
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Hi
1) x+7y=62 and 
  -x+2y=10   9y = 72, y = 8 and x = 6, (6,7) the solution
2) 3x+4y=12 and 
  -3x+ y=33   5y = 45, y = 9 and x = -8  (12-4*9)/3 ) (-8,9) the solution
3)4x-8y=1 and 
  4x-8y=2

  4x-8y= 1 
 -4x+8y= -2   |Multiplying 2nd Eq thru by -1
     0 &#8800; -1  there is NO solution