Question 685626
4x-5y=28
5x+6Y=14
================
-5(4x -5y =28)
4(5x +6y =14) 
-20x +25y =-140
20x +24y = 56
------------------ Add
49y = -84
y = -12/7
================
4x - 5y = 28
4x + 60/7 = 28
x + 15/7 = 7
x = 34/7