 algebra 1 homework help.? - XP Math - Forums Sign Up FREE! | Sign In | Classroom Setup | Common Core Alignment  XP Math - Forums algebra 1 homework help.? 07-27-2007 #1 jan_noel20002000 Guest   Posts: n/a algebra 1 homework help.? solving systems of linear equations1.y=2x+13x-4y=12.5x-6y=23x=6-3y3.x+y=12x-3y=84.x+2y=32x+y=55.y-3x=53(x+1)=y-26.2y=1-4x2x+y=0  07-27-2007 #2 Pedro Gonzaga Guest   Posts: n/a 1)y = 2x + 13x - 4(2x + 1) = 1y = 2x + 1-5x = 5y = 2(-1) + 1x = -1x = -1y = -12)5(6 - 3y) - 6y = 23x = 6 - 3y30 - 15y - 6y = 23x = 6 - 3yy = 1/3x = 6 - 3(1/3) y = 1/3x = 53)x + y = 12x - 3y = 8y = 1 - x2x - 3(1-x) = 8y = 1 - x5x = 11y = 1 - 11/5x = 11/5y = -6/5x = 11/54)x = 3 - 2y2(3-2y) + y = 5x = 3 - 2y6 - 4y + y = 5x = 3 - 2y-3y = -1x = 3 - 2(1/3)y = 1/3x = 7/3y = 1/35)y - 3x = 53(x+1) = y - 2y = 5 + 3x3x + 3 = 5 + 3x - 2y = 5 + 3x0x = 0Indeterminated6)2y = 1 - 4x2x + y = 0y = 1/2 - 2x2x + 1/2 - 2x = 0y = 1/2 - 2x0x = -1/2Impossible!  07-27-2007 #3 alexandrianicole91 Guest   Posts: n/a For number one just plug in the first equation into the second. You know what y is in terms of x so just shove it in about solve for x, then plug x in to solve for y. So 3x-2x-1=1, then x-1=1, so x=2. Then you can put that value into either equation and you find that y=5. So your solution is (2,5).Just do that for the others.  07-27-2007 #4 sidney03 Guest   Posts: n/a I'm working on a "take home final" from my college Algb. class. I can't take math and speak it!!!!! I'm going to be calling on all my Math coworkers!!!! Good luck!  07-27-2007 #5 Yasamin Guest   Posts: n/a starting w/ the first one you can use substitution:3x-4(2x+1)=13x-8x-4=1-5x=5x=-1once u figure either of the variables u plug it to figure out the other one Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
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