Question

x^2+y^2=25
4x^2-y^2=20, solve by elimination method. can someone show me step by step how to work this problem

Answer 1

\[x ^{2}+y ^{2}=25\]\[4x ^{2}-y ^{2}=20\]sum both and you get\[5x ^{2}=45\rightarrow x ^{2}=9\]Plug that into the first eq\[9+y ^{2}=25\rightarrow y ^{2}=16\]Thus,\[x=\pm3,y=\pm4\]

Answer 2

thank you!

Answer 3

hum... can i get a medal for this one? ;)

Answer 4

how do i do that? lol sorry im new at this

Answer 5

click best answer ;)
Cheers

Answer 6

Thank you

Answer 7

:) got it

Answer 8

np