If 1/x + 1/y = 3 and 1/x - 1/y = 7, what is the value of x + y? Express your answer as a common fraction.
+37159 Add the two equations together to get
1/x + 1/x = 10
2/x =10
x = 1/5
then find y 1/ 1/5 + 1/y = 3
5 + 1/y = 3
1/y = -2
y = -1 /2 you can finish ...yah?
