math help please, systems |
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 Jul 27 2005, 06:28 PM
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#1
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 not da vinci's mona lisa <3  Group: Member Posts: 644 Joined: Aug 2004 Member No: 39,781  |
hey guys
 i'm doing this summer packet for an honors geometry class i am planning on being in freshmen year of HS (next year) and i'm stuck on a problem. it seems soo simply.. yet when i try to figure out it seems complicated. please help me asap cause i need to send in the packet soon (before i leave for vacation) DIRECTION: SOLVE THE SYSTEM USING SUBSTITUTION OR ELIMINATION EQUATION 1: x^2 = y + 6 EQUATION 2: 5x = y (note: "^2" means squared) i already firgure out that by substituting "y" you would get: x^2 = 5x +6 but now where do i go from there? |
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Jul 27 2005, 07:10 PM
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#2
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 hi. call me linda. Group: Official Member Posts: 8,187 Joined: Feb 2004 Member No: 3,475 |
You then subtract the 5x+6 so that it reads x^2-5x-6=0. Then you factor that out (it comes out to (x-6)(x+1)=0). Then you make each factor equal to zero and solve for x.
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Jul 27 2005, 08:03 PM
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#3
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not da vinci's mona lisa <3 Group: Member Posts: 644 Joined: Aug 2004 Member No: 39,781 |
^ lol yeah thats what i thought but then
you get : x=# y=# x=# y=# like two sets of numbers. are you supposed to? and like how can you group it (x,y) (x,y) i hope that makes sense. thats the only part that confuses me cause i thought there was only one solution to a system (only one x and one y) |
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Jul 28 2005, 10:19 AM
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#4
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hi. call me linda. Group: Official Member Posts: 8,187 Joined: Feb 2004 Member No: 3,475 |
Hmm, well I think there can be multiple answers depending on how many variables/equations there are. So, there might be 2 answers.
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Jul 28 2005, 05:22 PM
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#5
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 show me a garden thats bursting to life Group: Staff Alumni Posts: 12,303 Joined: Mar 2005 Member No: 115,987 |
it becomes a (x,y) (x,y) problem.
I was good at these so I think this is right.  I totally forgot how to do these. But Your answer is (x-2)(x-3)...You will be needing these I assure you. You do pretty much what Linke said. You made me realize how much I miss math... |
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Aug 1 2005, 04:02 PM
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#6
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not da vinci's mona lisa <3 Group: Member Posts: 644 Joined: Aug 2004 Member No: 39,781 |
thank you guys
this topic can be closed. |
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Aug 1 2005, 04:04 PM
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#7
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show me a garden thats bursting to life Group: Staff Alumni Posts: 12,303 Joined: Mar 2005 Member No: 115,987 |
If you ever want anymore help, you can ask me if you want. I just did all the stuff you are going to be doing.
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Aug 1 2005, 04:08 PM
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#8
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not da vinci's mona lisa <3 Group: Member Posts: 644 Joined: Aug 2004 Member No: 39,781 |
alright thanks 
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Aug 13 2005, 12:43 AM
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#9
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Senior Member Group: Member Posts: 110 Joined: Aug 2005 Member No: 197,298 |
LOL I loved those problems they are so much fun! LoL but when they make you use substitution I hated it. I had to show my work and I'm not very good about that. I could do it in my head but I couldn't write it out. It made me so mad!
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