Question

Solve the system:
x^2+y^2=16
x+y=0

Answer 1

\[(-2\sqrt{2},2\sqrt{2});(2\sqrt{2},-2\sqrt{2})\]

Answer 2

those pair of equations create the null sign... I approve.

Answer 3

thank you so much

Answer 4

picture:
http://www3.wolframalpha.com/Calculate/MSP/MSP13771a0bh3ac1bchgf55000067g3c6hi9a5fcc4c?MSPStoreType=image/gif&s=15&w=400&h=298&cdf=RangeControl

not that you need to graph it to solve it, but hey.