SOLUTION: Please help to solve x^2 + y^2 = 36 2x^2 - y^2 = -9

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Please help to solve x^2 + y^2 = 36 2x^2 - y^2 = -9      Log On


   

Question 66228This question is from textbook An Incremental Development
: Please help to solve
x^2 + y^2 = 36
2x^2 - y^2 = -9 This question is from textbook An Incremental Development

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
x^2+y^2=36
2x^2-y^2=-9 now add these equations
-----------------------------
3x^2=27
x^2=27/3
x^2=9
x=+-3 substitute +-3 for x & solve for y
3*3+y^2=36
9+y^2=36
y^2=36-9
y^2=27
y=+-5.196