solving systems of eqns: x^2 - 2y^2 = 8, 4x^2 + 12y^2 = 112

nzl2006

New member
Joined
Nov 8, 2006
Messages
2
x^2 - 2y^2 = 8
4x^2 + 12y^2 = 112

I need help I cannot figure out what to do with all the squared variables. I thought that I needed to use the elimination method but I may be wrong.
 

steve_b

Junior Member
Joined
May 2, 2004
Messages
78
x^2-2y^2=8
4x^2+12y^2=112
I need help I cannot figure out what to do with all the squared variables. I thought that I needed to use the elimination method but I may be wrong.

==========

If this is part of the same take-home test, I again won't do the problem for you. Let me say, however, that I've done it by elimination and substitution, so both methods work. Look for example problems in your textbook to show you how to do it.

Steve
 

stapel

Super Moderator
Staff member
Joined
Feb 4, 2004
Messages
15,946
Solve one of the equations for a squared variable (not the variable itself, but the square of it), and then plug that into the other equation for that squared variable. Then solve that.

Eliz.
 
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