Question

How do u solve this equation by substitution 2x + 4y = 6 and 7x = 4 + 3y? Please help n explain

Answer 1

solve either equation for x or y, then plug that into the other equation

Answer 2

How?

Answer 3

solve 2x+4y=6 for y
y on one side and everything else on the other

Answer 4

Hmm...k I think im getting wat ur saying

Answer 5

subtract 2x from both sides then divide both sides by 4

Answer 6

K now no

Answer 7

what do you have?

Answer 8

Show me how please

Answer 9

Im not getting it

Answer 10

2x+4y=6
subtract 4y from both sides

Answer 11

Are u sure of what ur doing?

Answer 12

@DebbieG please help me out here

Answer 13

yes im sure, and people are not going to give you the answer
2x+4y=6
subtract 4y from both sides
if you cant do this then you should go back and learn what you missed

Answer 14

-4y = 2x - 6

Answer 15

I guess

Answer 16

\[2x+4y=6\]
subtract 4y from both sides
\[2x+4y\color{blue}{-4y}=6\color{blue}{-4y}\\2x+\cancel{4y}-\cancel{4y}=6-4y\\so\\2x=6-4y\]
with me?

Answer 17

@hubbabubba do you understand that?

Answer 18

Yes I got it now thx

Answer 19

well this is only the first step, there is more to do
now divide each term of 2x=6-4y by 2

Answer 20

Ok so its x = 3 - 2y right

Answer 21

correct, now we plug this in for x in the second equation
\[7\color{blue}{x} = 4 + 3y\]becomes\[7(\color{blue}{3-2y})=4+3y\]can you solve for y?

Answer 22

Yea already did n I got y as 1 idk if its right tho

Answer 23

yes that is correct
so y=1
now we use any equation to find out what x is
i would use this one
x=3-2y
x=3-2*1
x=1
so the solution is
(1,1)

Answer 24

Yaaay!!!! Im right yea I got that thanx sooo much. Thats the way I like explanation to be :)

Answer 25

Ok I have another question but instead we are gonna use elimination

Answer 26

Think u can help me out??

Answer 27

m - n = -9
7m + 2n = 9

Use elimination method

Answer 28

Help here

Answer 29

Hello...anybody there?????