plz help with equation 5x-9y=11=3x+7y=19

Answer 1

I assume you mean the system of equations

5x-9y=11
3x+7y=19
multiply the top by 7 and the bottom by 9, then add them:

35x-63y=77
27x+63y=171

62x=248
x=4
so, y=1