<PRE><B>Question 722929</B>
2x + 3y = 13


2(8) + 3(-1) = 13 ... plug in (8,1)


16 - 3 = 13


13 = 13


so (8,1) satisfies the first equation


-------------------------------------------------------

 
x - y = 9


8 - (-1) = 9 ... plug in (8,1)


8 + 1 = 9


9 = 9


and (8,1) satisfies the second equation


--------------------------------------------------------------


(8,1) satisfies BOTH equations at the same time, so it is the solution to the system of equations</PRE>