Question

Solve the following system by substitution y=x-1
y=-4/3x-8
A. 4,3
B. 3,4
C. -4,-3
D.-3,4

Answer 1

Help give medal

Answer 2

\[\huge~\rm~x-1=\frac{ -4 }{ 3 }x-8\]
Solve for x
I plugged equation 1 into equation 2

Answer 3

So then if you substitute you get -16/3 but it not equal to -8

Answer 4

Now quite...
\[\huge~\rm~x-1+4/3=\frac{ -4 }{ 3 }x+4/3-8\]
\[\huge~\rm~\frac{ 7 }{ 3 }x-1=-8\]
\[\huge~\rm~\frac{ 7 }{ 3 }x-1+1=-8+1\]
\[\huge~\rm~\frac{ 7 }{ 3 }x=-7\]
Now solve for x

Answer 5

i think you have all the help you need she seems to be doing great

Answer 6

achuley perfect

Answer 7

Thanks! =)

Answer 8

If you plug 4 for x right because u use the first problem

Answer 9

Now we are only solving for x

Answer 10

For right now

Answer 11

yea you are very good at math

Answer 12

But then how do use substition method

Answer 13

\[\huge~\rm~\frac{ 7 }{ 3 }x \div \frac{ 7 }{ 3 }x=-7 \div \frac{ 7 }{ 3 }x\]

Answer 14

Did you look at the steps I wrote out above?

Answer 15

Don't you plug the first plug 1 into 2

Answer 16

It doesnt matter how you plug them in....you sill get the same answer

Answer 17

\[\huge~\rm~x=-7 \div \frac{ 7 }{ 3 }x\]

Answer 18

Yea you added-4/3 to both sides

Answer 19

We are way past that...

Answer 20

I got -1/3 but

Answer 21

For x

Answer 22

Thats incorrect
What is -7 divided by 7/3 ?

Answer 23

Oh it's -3

Answer 24

Oh ok I get it know so then it is d right

Answer 25

@pooja195

Answer 26

My bad answer d was suppose to be -3,-4

Answer 27

Does that change anything

Answer 28

D is correct correct =)

Answer 29

What do you mean by "Does it change anything?"

Answer 30

But the 4 in d I forgo to put - sign in front of the 4

Answer 31

That's why I was asking if it changes anything

Answer 32

We know that x=-3 right
We can substiitue the value of x into
y=x-1
\[\huge~\rm~ y=(-3)-1\]
\[\huge~\rm~ -4=(-3)-1\]
So -3-1=-4
therefore y=-4

Answer 33

@taylor0402 thank you anways

Answer 34

Oh ok thank so much you been do patient with me @pooja195

Answer 35

It d then

Answer 36

haha no problem ^-^ Our goal is to help users understand =) their question patience is the virtue!
Yes correct it is D :)