Question

how do I figure X^2+y^2=25 if y=2x how do I figure X^2+y^2=25 if y=2x @Mathematics

Answer 1

so do you mean solve for x?

Answer 2

and y

Answer 3

\[x^2+(2x)^2=25\]

Answer 4

is a start

Answer 5

i see x^2+(2x)^2=25, but that is where i get lost

Answer 6

\[x^2+2^2x^2=25\]

Answer 7

\[x^2+4x^2=25\]

Answer 8

OK, thanks. Let me work that for a bit.

Answer 9

\[5x^2=25\]

Answer 10

ok

Answer 11

I get \[x=\sqrt{5} \] and \[y=2\sqrt{5}\]

Answer 12

don't forget about the plus/minus

Answer 13

good point