Question

Solve
X+Y= 1
X-Y= 7

Answer 1

there has to be like one

Answer 2

of the answers

Answer 3

to the variables

Answer 4

is that the whole question ???

Answer 5

Its a simultaenous equation do you have any ideas?

Answer 6

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

Answer 7

oh i hate question like this

Answer 8

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.

Answer 9

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

Answer 10

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

Answer 11

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

Answer 12

then*

Answer 13

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

Answer 14

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

Answer 15

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

Answer 16

AND YOU WOULD GET ????

Answer 17

8

Answer 18

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

Answer 19

correct @bleumom22 see now you get for #2

Answer 20

Can you solve for X now?

Answer 21

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

Answer 22

Good. Let me know what you get for X

Answer 23

ok
x=4?

Answer 24

Yes.

Answer 25

good job

Answer 26

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

Answer 27

Glad to help :)

Answer 28

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

Answer 29

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

Answer 30

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?

Answer 31

as one of the varibles*
to reverse calculate?

Answer 32

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

Answer 33

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

Answer 34

ok thank you to @incomplte and @ashlynn143

Answer 35

your welcome i gtg for like 15 min