Answer:
(10,-1)
Step-by-step explanation:
x - y = 11
2x + y = 19
Add the two equations together to eliminate y
x - y = 11
2x + y = 19
-----------------------
3x = 30
Divide each side by 3
3x/3 = 30/3
x = 10
Now find y
2x+y =19
2(10) +y = 19
20+y = 19
Subtract 20 from each side
20-20 +y = 19-20
y = -1
