I Need Help With Maths Desperately!!! Watch

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CHAD
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#1
Report Thread starter 16 years ago
#1
Hi
Can ayone explain to me how to solve a simualtaneous equation? I need to know for my maths mock gcse tomorrow.
Thank-you!
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George-W-Duck
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taking 3x + 4y = 12 and x + 2y =4 as examples

when doing simultaneous equations you need to make sure that either your x values or your y values are equal so in the above examplemultiply the second equation by 2 to give:

3x + 4y = 12
2x + 4y = 8

From this you can see that the extra x makes it go up by 4 so x = 4 (but if you couldnt see this then subtract the equations from each other to get 3x-2x = 12-8)

Now you know x = 4 you can pu this into one of your equations such as the '3x + 4y = 12' to get 3*4 + 4y = 12 , so 4y = 12-12 which is 0.
A crap example but i hope you follow it. good luck with the exam.
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CHAD
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(Original post by George-W-Duck)
taking 3x + 4y = 12 and x + 2y =4 as examples

when doing simultaneous equations you need to make sure that either your x values or your y values are equal so in the above examplemultiply the second equation by 2 to give:

3x + 4y = 12
2x + 4y = 8

From this you can see that the extra x makes it go up by 4 so x = 4 (but if you couldnt see this then subtract the equations from each other to get 3x-2x = 12-8)

Now you know x = 4 you can pu this into one of your equations such as the '3x + 4y = 12' to get 3*4 + 4y = 12 , so 4y = 12-12 which is 0.
A crap example but i hope you follow it. good luck with the exam.

thank-you soooo much!
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George-W-Duck
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anytime mate
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