Question 1087459
x+y = 153
x-y = 35
add them up:
x+y = 153
+
x-y = 35
----------
2x = 188
now solve for x:
x = 94
Since x+y = 153: 153-94 = 59
* * * * * * * * * * * * * * * 
Check:
x-y = 35
94-59 = 35 Correct