Simultaneous equations help

Hi, I need a bit of help on how to solve the following. y = -4x + 4 y = x2 -6x - 8 I have tried to substitute equation one into equation two ( RHS must be equal) to give -4x + 4 = x2 -6x -8 I have then added all like terms to give but im then stuck and I think i have got the method wrong. Bit confused due to x2 and y = as I thought i did understand how to solve these so im now annoyed. x2 -10x -4 Any help on how to solve this would be helpful. Thanks

Jian-Peng

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Answers

Well you've got a little confused I think along the way. You were right to start with

chloe

04 May 2011

simplifying we get

chloe

04 May 2011

now we need to get everything over to one side so what we have

chloe

04 May 2011

now from this we've got a quadratic but we can't factorise it because there are no factors of -12 that add up to -2 so theoretically we'd have to use the quadratic forumla to find x

chloe

04 May 2011

However I have a feeling that maybe you've written the question down wrong on here because usually you should be able to solve by factorising with these types of questions. Are you sure the two equations are and ?

chloe

04 May 2011

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