solve  by elimination method
1} 7x=8y+11  &  8x-7y-7=0

​plz fast 
 

7x=8y+11
=>7x-8y=11........(1)
and8x-7y=7.......(2)
multiplying (1) by 8 we have
56x-64y=88........(3)
Also multiplying (2) by 7
56x-49y=49.......(4)
NOW in eq.'s (3)&(4) using ELIMINATION METHOD 
 56x-64y= 88
 56x-49y= 49
-     +       -      
-15y=39
y=-39/15
y=-13/5
Putting in (1)we have
7x=11+8(-13/5)
7x=55-104 / 5
x=-49/7*5
x=-7/5
Hence x=​-7/5 ;y=-13/5