Question 230975
Two integers: x & y
:
Two integers have a sum of 255.
x + y = 255
:  
The difference of the two numbers is 45.
x - y = 45
:
 What are the two numbers.
:
Elimination is the easy way. add the two equations
x + y = 255
x - y = 45
----------------adding eliminates y
2x = 300
x = 150
;
150 + y = 255
y = 255 - 150
y = 105