D drr61 New member Joined Sep 6, 2005 Messages 1 Sep 7, 2005 #1 Re: Just not understanding X,Y variables x + y = 4 x - y = 5 How do I solve this? This particular problem is to be solved by substitution. Please explain! Thanks, Drr
Re: Just not understanding X,Y variables x + y = 4 x - y = 5 How do I solve this? This particular problem is to be solved by substitution. Please explain! Thanks, Drr
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,337 Sep 7, 2005 #2 Re: Just not understanding X,Y variables drr61 said: x + y = 4 x - y = 5 solved by substitution. Click to expand... Solve one for one variable and substitute into the other. Solve one for one x - y = 5 ==> x = y + 5 Substitute into the other x + y = 4 (y+5) + y = 4 You're not quite done...
Re: Just not understanding X,Y variables drr61 said: x + y = 4 x - y = 5 solved by substitution. Click to expand... Solve one for one variable and substitute into the other. Solve one for one x - y = 5 ==> x = y + 5 Substitute into the other x + y = 4 (y+5) + y = 4 You're not quite done...
