Thread: simultaneous equations

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

where do I start

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

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.

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.

Solve the top equation for y:


Insert this into the second equation:


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

-Dan

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