Question

Can someone please check my work? Please? I would really appreciate it...
Question~
Solve the systems using the elimination method.
y = x - 1
y = -x + 7

Answer 1

My Answer~
-2x+y=-1
X+y=7
=
-2x+y=-1 Multiply by 1
X+y=7 multiply by 2
=
2x-1=-x+7
3x-1=7
3x=8
X=8/3
Y=13/3
Final answer~ (8/3, 13,3)

Answer 2

What my teacher said was wrong~
your first equation under Answer doesn't make sense

Answer 3

how did you get -2x+y=1? there was only 1 x on both equations wasn't there?

Answer 4

-2x+y=-1 i meant

Answer 5

well I wasn't sure how to answer this question, so I asked my brother for help and he told me to start with that... He didn't tell me how he got it

Answer 6

do you understand how to eliminate x from both equations by adding them together?

Answer 7

somewhat...

Answer 8

ok so we have (1) y = x - 1, and (2) y = - x + 7

what's (3) if you add (1) and (2) together?

Answer 9

So 3+1+2=6 is that what you meant to do?

Answer 10

no those are just names for each equation I could have picked (A) (B) and (C) or (T) (F) (G) or whatever, by (1) I mean't the entire equation y=x-1, by (2) I meant the equation y=-x+7 and (3) is adding (1) and (2) together, do you know how to do that?

Answer 11

I'm not sure... I'm sorry I have a hard time with math

Answer 12

ok what's y + y? and x + -x? and 1+7?

Answer 13

y+y=y or 2y?

Answer 14

2y, and x+ -x?

Answer 15

-2x?

Answer 16

no, what's 1+ (-1)

Answer 17

0

Answer 18

that's right, so do you get how we can get 2y = 0x + (1+7) now? and what is y now?

Answer 19

I don't think I understand what you mean by "what is y now?" wouldn't it be 2y still?

Answer 20

what's 2y equal to right now then?

Answer 21

8y?

Answer 22

no we had 2y = 0x + 1 + 7, what is 2y alone equal to?

Answer 23

2y

Answer 24

and that is equal to what on the right hand side?

Answer 25

0x+1=2?
I'm not sure if that is how I do it...