Question

2y=-42-4x
-x+2y=23

Answer 1

Okay...there are 2 ways of solving this...but I will be using the substitution method...

Can you solve that first equation for 'y' ...?

Answer 2

y-mx+b??

Answer 3

Well yes that will be the form...can you put that top equation into that form?

Answer 4

y=-42-2x??

Answer 5

Close

2y = -42 - 4x

We want to isolate 'y' soo we divide everything by 2

2y = -42 - 4x
-------------
2 2 2

y = -21 - 2x

right?

Answer 6

right

Answer 7

Okay...so now that we know what 'y' equals...

y = This stuff....

We can go into our second equation...and where we see a 'y'...we replace it with "this stuff"

Our second equation:

-x+2y=23

Replace the 'y' with the -21 - 2x we just found...so

-x+2(-21 - 2x) =23

Now we just simplify that

Answer 8

tooo x=1

Answer 9

hmm

-x + 2(-21 - 2x) = 23

after distributing the 2...

-x - 42 - 4x = 23

combine the -x - 4x...

-5x - 42 = 23

add 42 to both sides

-5x = 65

Divide both sides by -5

x = -13

See what I did there?

Answer 10

yes stalker i did thanks :)

Answer 11

Lol well we're not done yet...

Now that we know what 'x' equals....we need to find what 'y' equals...

so take either of your original equations...lets do the first one:

2y=-42-4x

We now know x = -13....so replace the 'x' here with that

2y=-42-4(-13)

distribute the -4...

2y = -42 + 52

do the addition....-42 + 52 = 10 so...

2y = 10

divide both sides by 2...

y = 5

All make sense? :)

Answer 12

yupp thanks darlin

Answer 13

No problem! Now I don't want to see you posting any more questions like this! Solve them like this :P

Answer 14

fine .-.

Answer 15

:P haha sooo kidding :D

Answer 16

lol u better beh lol

Answer 17

pfft or what!? :P