Question

Solve the system of linear equations below.

6x + 3y = 33
4x + y = 15

Answer 1

y=15-4x

Answer 2

it has to be x=

Answer 3

I just started it

Answer 4

Substitute y=15-4x in first equation, you will get the value of x

Answer 5

Cool people use matrices. Be a cool person. Use matrices.

Answer 6

oh i apologize.

Answer 7

i'm taking a pretest.
So i have never seen this stuff before.
so if you'll explaine it or show your work id appraciate it! (:

Answer 8

You could solve it by saying \(y=15-4x\), then sticking that into \(6x+3\left(15-4x\right)=33\), and solving for \(x\) which should make \(y\) easy to find.

Answer 9

So can you work it out for me? :D

Answer 10

No, WolframAlpha has you covered on that. http://www.wolframalpha.com/

I'm not going to do a machine's job! http://www.youtube.com/watch?v=gAYL5H46QnQ

Answer 11

heres the answer for the first one: http://www.wolframalpha.com/input/?i=6x++%2B++3y++%3D++33

Answer 12

heres the answer for the second one: http://www.wolframalpha.com/input/?i=4x++%2B+++y++%3D++15 hope this helps !(:

Answer 13

Hey @Kyrie - I can help you with this

Answer 14

So, here you have two systems of equations, and you want to find a way to make at least one of the equations have only ONE variable - does that make sense? So, in this example, we want to get rid of the y in one of the equations

Answer 15

y=11-2x......
thats what the machine told me.
but Idk what the real answer is i'll post the multiple choice kk?

Answer 16

So... we need to have something that equals y in our equation instead, understand? In this case, we have two sets of equations, but I'm going to use the second equation to find something that equals Y.

\[4x + y = 15\]
subtract 4x from each side of the equation (everything you do in algebra has to be done to BOTH sides of the equation to make it equal). This gives us:
\[y = 15-4x\]

Now, we have something that equals Y. So, going back to our first equation, let's put in our new 'Y':
\[6x + 3(15-4x) = 33\]

Answer 17

A. x = 2, y = 7
B. x = -13, y = 7
C.x=-2/3
D.x = 5, y = 1

Answer 18

Well, do you understand what I've done so far? This is the substitution method btw

Answer 19

Alright

Answer 20

Oh i done C wrong :(

Answer 21

x=2, y=7 Right?

Answer 22

Nice work - you got it!