Question 167544
elimination method:
9x-9y=36
7y-3x=-14

eq 1:
x-y = 4
x = y+4

eq 2:
3x =  7y+14
x = (7y+14)/3

1 and 2 
=> y+4 = (7y+14)/3
=> 3y+12 = 7y+14
=>4y = -2
 => y = -1/2

x = 7/2