# simultaneous equations HELP!!

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#1
Does anyone know an easy way to do simultaneous equations? I've tried everything and just can't seem to get it right!

thanks 0
5 years ago
#2
Rearrange one equation to make it x= or y= and then just sub it into the other equation. One of the unknowns won't be there, when you have the answer for one sub it back into a equation for the other unknown.
0
5 years ago
#3
If you post an example question, or one you're specifically stuck on, we'd be able to put the method into context so you'd understand easier But yes, as chloe_32 stated, I would rearrange either equation 1 or 2 and substitute it into the other.

For example;

If we have

Equation 1: and
Equation 2: If we take Equation 1 and rearrange for we get:   Now if we substitute this into Equation 2 Now we can solve Equation 2 for You would get    Now, let's substitute this value into equation 1 to get the value.     Therefore you have and Hope this helps P.S. I made the question up on the spot, don't be thrown off by the answers, concentrate on the method instead 0
#4
(Original post by chloe_32)
Rearrange one equation to make it x= or y= and then just sub it into the other equation. One of the unknowns won't be there, when you have the answer for one sub it back into a equation for the other unknown.
Thank you!!
0
#5
(Original post by edothero)
If you post an example question, or one you're specifically stuck on, we'd be able to put the method into context so you'd understand easier But yes, as chloe_32 stated, I would rearrange either equation 1 or 2 and substitute it into the other.

For example;

If we have

Equation 1: and
Equation 2: If we take Equation 1 and rearrange for we get:   Now if we substitute this into Equation 2 Now we can solve Equation 2 for You would get    Now, let's substitute this value into equation 1 to get the value.     Therefore you have and Hope this helps P.S. I made the question up on the spot, don't be thrown off by the answers, concentrate on the method instead Thank you so much!! In regards to the specific example how would you work out:

4x + 6y = 12
x + y = 1
0
5 years ago
#6
(Original post by libertyd)
Thank you so much!! In regards to the specific example how would you work out:

4x + 6y = 12
x + y = 1
Y=1-x
Substitute

Posted from TSR Mobile
0
5 years ago
#7
(Original post by libertyd)
Thank you so much!! In regards to the specific example how would you work out:

4x + 6y = 12
x + y = 1
Well here we have a simple choice don't we.

You can start by rearranging equation 2 to get or To make it easier for yourself, always go for the simplest equation. No matter which equation you rearrange, the outcome will be the same.

Try it 0
5 years ago
#8
(Original post by libertyd)
Thank you so much!! In regards to the specific example how would you work out:

4x + 6y = 12
x + y = 1
So you would rearrange the second to be x=1-y or y=1-x its your choice.

Then sub it in

y=1-x
4x + 6(1-x) =12
And work from there

work out your X, then sub into original equation to get y
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