Question 604612
Take the first equation, 7x-y=-2, plug in x = 1 and y = 9 to get


7x-y=-2


7(1)-(9)=-2



From here, simplify and evaluate. If the end result is true (something like 1=1), then the ordered pair satisfies the first equation.


Rinse and repeat but do so for the second equation. Plug in x = 1 and y = 9 into the second equation and see if a true equation results. 



If BOTH equations are satisfied, then (1,9) is indeed a solution. 
If either equation (or both) are NOT satisfied, then (1,9) is NOT a solution