Question

please help medal and fan
For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

-x + 2y = -6
3x + y = 8

Answer 1

-2y + 6
2y - 6
2y + 6
-2y - 6

Answer 2

do u jst need to solve using subsitution?

Answer 3

yes

Answer 4

with these
2y - 6
2y + 6
-2y - 6

Answer 5

u there

Answer 6

yes...confused though

Answer 7

so am I do u know any one that can help

Answer 8

@TheSmartOne PLEASE help

Answer 9

do u understand this

Answer 10

u there

Answer 11

@mathmate please help

Answer 12

I got to leave sorry.
But @mathmate @sleepyjess @pooja195
might be able to help you.

Answer 13

thank you

Answer 14

do u understand this

Answer 15

Given:
-x + 2y = -6
3x + y = 8

From first equation:
-x + 2y = -6
2y+6=x
or
\(\color{red}{x}=\color{red}{(2y+6)}\)
Substitute into second equation:
\(3(\color{red}{2y+6} )+ y = 8\)
Distribute the multiplication by 3 and solve for y.

Answer 16

so it would be
6y+18+y=8?

Answer 17

Yes, so far so good!

Answer 18

ok now what do I do

Answer 19

@mathmate

Answer 20

Isolate y on the left, and numbers on the right, and solve for y.
Y will be a fraction, but just keep going.

Answer 21

so it would u combine like terms to

Answer 22

To isolate y, you need to first add together the like terms of y:
6y+18+y=8
becomes
7y+18=8

Can you continue?

Answer 23

yes ok so it would then be
18=8-7y

Answer 24

If I were you, I would keep the 7y on the left, but subtract 18 from both sides.
You want to keep variables on the left, and numbers on the right.
7y+18=8
subtract 18 from both sides
7y+18-18=8-18

Can you continue?

Answer 25

ok so it would be
7y=-10 and no

Answer 26

Don't worry, as I said, the answer for y will not be a whole number.
I have to go now, perhaps you can tag others to continue. You're doing fine so far.

Answer 27

wait can I just tell you what I think the answer is

Answer 28

I am here now xD

Answer 29

yay thank you

Answer 30

if you look at the choices I dont think were doing this right
-2y + 6
2y - 6
2y + 6
-2y - 6

Answer 31

Hmm well the question didn't ask to solve for a variable..

Answer 32

right

Answer 33

It says to isolate x in
-x + 2y = -6

Answer 34

yeah so do I just subtract 2y from both sides

Answer 35

\(\color{blue}{\text{Originally Posted by}}\) @mathmate
Given:
-x + 2y = -6
3x + y = 8

From first equation:
-x + 2y = -6
2y+6=x
or
\(\color{red}{x}=\color{red}{(2y+6)}\)
Substitute into second equation:
\(3(\color{red}{2y+6} )+ y = 8\)
Distribute the multiplication by 3 and solve for y.
\(\color{blue}{\text{End of Quote}}\)

The answer is in red.. lol

Answer 36

But we have
-x + 2y = -6

Answer 37

Oh I feel stupid thank you

Answer 38

We could just add x and add 6 on both sides.

Answer 39

so thats not the answer

Answer 40

-x + 2y = -6
+x +x
-------------
2y= -6 + x

2y = -6 + x
+6 +6
-----------
2y+6 = x

Answer 41

It is.

Answer 42

of thank you

Answer 43

oh*

Answer 44

np :)

Answer 45

can u help me with another one please