Thread: simultaneous equations

1. simultaneous equations

x-y=0
x^2 + y^2= 18

where do I start

2. From the first equation $x=y$.
Plug x in the second and solve for y. Then find x.

3. thanks but

I understand that bit and the answer is ovbious but I'm unsure of how to get 3 and show how I did from x and y.

4. Originally Posted by lra11
I understand that bit and the answer is ovbious but I'm unsure of how to get 3 and show how I did from x and y.
$x - y = 0$

$x^2 + y^2 = 18$

Solve the top equation for y:
$y = x$

Insert this into the second equation:
$x^2 + (x)^2 = 18$

Solve for x. When you are done, put these x values into the y = x equation to get your y values.

-Dan

5. dumb moment

thanks I've got it.I was having a bit of a stupid moment. thanks for the help