Question

Use elimination to solve the system. What is the value of x?
4x + 7y = -14 and 8x + 5y = 8

Answer 1

Hint: Multiply everything in the first equation by -2 to go from

4x + 7y = -14

to

-8x - 14y = 28

Answer 2

So you now have the two equations


-8x - 14y = 28
8x + 5y = 8

Answer 3

That's solving for x first and then plugging it back to get y. I thought that the OP wanted to do it from that one step.

Answer 4

you can go a number of ways, you can multiply the top equation by 5 and the bottom equation by -7, then add

Answer 5

im just getting more confused

Answer 6

I believe the answer is -14.

Answer 7

these are the options.
3.5
-1.5
8
-4

Answer 8

Oh then i bet the answer is -5

Answer 9

Do you see how I went from

4x + 7y = -14

to

-8x - 14y = 28

Answer 10

it's not -5

Answer 11

please don't give away the (incorrect) answer

Answer 12

sorry, if you would just give her the right answer, i would be able to go on with my day. As would she

Answer 13

I'm providing hints and trying to walk her through it (without giving it all away)

Answer 14

No matter how many hints your provide she doesn't care. she just wants the answer

Answer 15

well that's not what this site is for, I'm sry

Answer 16

if you keep this behavior up jefferyflow123go you will be reported (and possibly suspended/banned)

Answer 17

its hard for me too understand..im trying. i learn better in a class room thats why i am having trouble with my online class

Answer 18

its ok, you don't have to understand everything at once katie2212

Answer 19

but i have to understand if i want to finishe this exam.

Answer 20

Sorry for hekping. My mom always taught me to hekp and have pride in my work, so trying to be of assistance. I didn;t realize that you can be the only genious here. If you were that smart you'd know that she doesn't understand your hints and just wants the answer.

Answer 21

that's not helping though, you may think it is...but it's not

Answer 22

if you want, you can provide the steps so she can learn from them

Answer 23

okay will you guys please stop arguing and just help me!

Answer 24

ok I'll give steps on this one and hopefully it will be enough to answer similar ones, sound good?

Answer 25

IS your refrigderator running
? IF SO GO CATCH IT

Answer 26

yes thank you

Answer 27

My momma once told me, a fast runna' is the best runnna'

Answer 28

jeffery if youre not going to help please get out.

Answer 29

BUT IM JUST TRYNA HELP YOU. ILL CATCH YOUR FRIDGE FR YOU.

Answer 30

What did the bison say to his son when he left for college? Bi-son

Answer 31

4x + 7y = -14 ... Start with the first equation

-2(4x + 7y) = -2*(-14) ... Multiply both sides by -2

-8x - 14y = 28 ... Distribute and multiply

---------------------

So

4x + 7y = -14

is the same as

-8x - 14y = 28

---------------------

This means that the system

4x + 7y = -14
8x + 5y = 8

becomes


-8x - 14y = 28
8x + 5y = 8


Now add the two equations:


-8x - 14y = 28
8x + 5y = 8
--------------
0x - 9y = 36

which means that

-9y = 36

Solve for y to get

-9y = 36

y = 36/(-9)

y = -4

Now that we know that y = -4, we can use this to find x. Pick on any equation, plug in y = -4 and solve for x


4x + 7y = -14

4x + 7(-4) = -14

4x - 28 = -14

4x = -14 + 28

4x = 14

x = 14/4

x = 7/2

x = 3.5


So the value of x is x = 3.5

Answer 32

IM SO PUN-NY

Answer 33

IM A MaTH WIZ

Answer 34

Thank you Jim

Answer 35

yanno wizard like Harry Potter

Answer 36

The idea here is to get the x coefficients equal and opposite. Then you add the equations. Doing so will cancel out the x terms so you can solve for y

Answer 37

then you use that value of y to find x

Answer 38

you've been reported jefferyflow123go, have a nice day

Answer 39

you too good sir(:

Answer 40

good luck with that one, I don't spam and harass others so your claim will be without merit