Quoting Post Archived Topic: It will not be bumped to the top of the forum. Topic need sum help on math question Membername   Not a member? Sign Up Free (takes 20 seconds) Password   Forgotten your password? Post Font: Verdana Arial Black Georgia Comic Sans Impact   Size: Tiny Normal Big Huge   Color: Default Dark Red Red Orange Brown Green Olive Cyan Blue Dark Blue Indigo Black [ Check Spelling ] [ Post Preview ] [ LiveTags ] Quote: from [m]PreppyPeyton[/m] at 8:18 pm on Jan. 5, 2009[quote]Thats some 7th grade ish, well for me. I will not help you with your homework, nah I dont have any paper and dont feel like doing the head thing.[/quote] FAQ Keyword Search: Post Options Favorites Manager Notify me of new replies to this topic by email Notify me of new replies to this topic by private message Original Post ashleexoxo Posted at 8:16 pm on Jan. 5, 2009 well i do know you have to plug in numbers but can somehelp me??? im trying to get help on all the problems i dont know solve each system by substitution 1.   x - y +2z = 7      2x + y + z = 8      x         -z  = 5 2.   5x - y + z = 4       x +2y - z = 5     2x + 3y -3z = 5

Replies HuffleHaire Posted at 8:26 pm on Jan. 5, 2009 Quote: from XTCofGOLD at 10:18 pm on Jan. 5, 2009 x-z=5 so x=5+z so Everytime you see an X, substitute (5+z) in place of the x. And then combine the two resulting equations to get your final variable noraa Posted at 8:20 pm on Jan. 5, 2009 Quote: from XTCofGOLD at 8:18 pm on Jan. 5, 2009 x-z=5 so x=5+z so Everytime you see an X, substitute (5+z) in place of the x. nooo. x=blank z=-5 ivy1994 Posted at 8:20 pm on Jan. 5, 2009 The first one is 0 the second is 4 matto Posted at 8:19 pm on Jan. 5, 2009 use descriminants instead!  so much faster. PreppyPeyton Posted at 8:18 pm on Jan. 5, 2009 Thats some 7th grade ish, well for me. I will not help you with your homework, nah I dont have any paper and dont feel like doing the head thing. XTCofGOLD Posted at 8:18 pm on Jan. 5, 2009 x-z=5 so x=5+z so Everytime you see an X, substitute (5+z) in place of the x. noraa Posted at 8:18 pm on Jan. 5, 2009 that's really easy. However I don't feel like working them because i have my own damn math that's not for the sixth grade. bakaninja Posted at 8:17 pm on Jan. 5, 2009 huh??? boombabyboom Posted at 8:17 pm on Jan. 5, 2009 1. 0 2.4 All 9 previous replies displayed.