<PRE><B>Question 843798</B>
Instead of multiplying, try using the linear combination method.
Multiply the first equation by 9 and the second equation by 7.
First equation:     36x+63y=684
Second equation: 21x-63y=-399
Now add the two equations together. The Ys will cancel.
57x=285
Now solve for x.
x=5
Plug 5 in for x into either original equation
36(5)+63y=684
Now just solve for y.
180+63y=684
63y=504
y=8
x=5 and y=8</PRE>