Solve
X+Y= 1
X-Y= 7

- anonymous

Solve
X+Y= 1
X-Y= 7

- jamiebookeater

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- anonymous

there has to be like one

- anonymous

of the answers

- anonymous

to the variables

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## More answers

- anonymous

is that the whole question ???

- anonymous

Its a simultaenous equation do you have any ideas?

- anonymous

yes thats the whole question the + equation is on top of the - equation

- anonymous

oh i hate question like this

- anonymous

I don't have a clue it all looks foriegn to me. I looked through my notes and I see nothing similar to this problem.

- anonymous

yah i've learned some really tough things and i have never done something like this

- anonymous

Start by\[X=1-Y\]
Plug that into the second eqn

- anonymous

ok but htne there aren't any values for the the other equations do I'm suiming it has to be a negative number. someone told me for a similar problem with one negative answer and one positive answer I could add both equations and then muliplty the result and substitute it for either varible to find the other. it worked for that problem but not for this one wwhere both answers are positive

- anonymous

then*

- anonymous

well if it is like how @incomplte said then i have the answer but if it is like how you are saying then i dont know

- anonymous

ok ill try it his way
but im still coming up blank

- anonymous

ok for the second one it is 1 - (-7)

- anonymous

AND YOU WOULD GET ????

- anonymous

8

- anonymous

Eqn 2 becomes\[(1-Y)-Y = 7\]
So1-2Y=7
-2Y=6
Y=-3

- anonymous

correct @bleumom22 see now you get for #2

- anonymous

Can you solve for X now?

- anonymous

just substitiue for y and then ill get the x variable?

- anonymous

Good. Let me know what you get for X

- anonymous

ok
x=4?

- anonymous

Yes.

- anonymous

good job

- anonymous

im sorry can you tell me the first step to solving this.

- anonymous

Glad to help :)

- anonymous

I have two exams next week and need to remember this.

- anonymous

Just start by Solving for X
So from X+Y=1, say X=1-Y
then plug that into the second equation.

- anonymous

oooh. ok and then just input the answer for one of the variables then divide the varible by its self and the answer by its self to get the variable's value?

- anonymous

as one of the varibles*
to reverse calculate?

- anonymous

Yes. If you have any more questions just @ my username. Ill get a notification and i can help later

- anonymous

and i will try to help you if you need it ok

- anonymous

ok thank you to @incomplte and @ashlynn143

- anonymous

your welcome i gtg for like 15 min

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