Question 843165
x + 7y = 62
6x - 6y = 48
The solution is not -1, 9
-1+63=62 works in the first equation
-6-54=48
-60=48 doesn't work in the second

x + 7y = 62
6x - 6y = 48

x=14.750,   y=6.7500
x =59/4, 14 3/4 y = 27/4=6 3/4

I think you want 
x + 7y = 62
6x plus 6y = 48