help please i forgot

[sportychick9890]

What are the rules again for adding, subtracting, multiplying and dividing problems like so.



ex: x+y=85
-x=y= 45

 

[Denis]

Post a complete problem example.

 

[Gene]

If that is solving two equations in two unknowns and one of your = is a +
x+y=85
-x+y=45
Adding:
x-x + y+y = 130
0+2y=130
y=65