Question

Please help. Will give medal!
Solve the system of equations by elimination.
3x + 4y = -31
2x - 4y = -6

Answer 1

add the equations, and tell me what you get.

Answer 2

Would it be 5x = -37? I'm sorry I'm really bad at this

Answer 3

Yes, good

Answer 4

Now, you can solve for x

Answer 5

x = 7.4?

Answer 6

My answer choices are
(4, 5)
(5,4)
(-5, 12.5)
and (5, -4)

Answer 7

x = -37/5 = -7.4

Answer 8

Would I just need to plug the choices in??

Answer 9

your shoices are wrong

Answer 10

Those are the 4 answers I have to choose from

Answer 11

They are wrong

Answer 12

They can't be wrong...it's a multiple choice question

Answer 13

We have just found that x=-7.4.
This is exactly correct!!

Your answers don't contain that x-coordinate,
and therefore they are not correct!

Answer 14

Btw I wrote the equation wrong as well...it's actually 31 positive not negative

Answer 15

Good

Answer 16

3x + 4y = 31
2x - 4y = -6

Answer 17

Add the equations

Answer 18

Let me try to figure it out again by myself...I'll get back to you when I do.

Answer 19

Theres no way they could be "wrong". It's a multiple choice question. I have to use one of those 4

Answer 20

I'm thinking I just have to plug in my answer choices and see from there

Answer 21

For,

3x + 4y = 31
2x - 4y = -6

they are probably right.

But,

3x + 4y = -31
2x - 4y = -6

as you initially wrote, they would be wrong

Answer 22

Okay

Answer 23

You can plug in the answer-choices, or you can solve for x and y.

Answer 24

The answer was 5,4)

Answer 25

3(5) + 4(4) = 31
2(5) - 4(4) = -6
15 + 16 = 31
10-16=-6
25 = 25

Answer 26

```
The addition gives,

3x   + 4y = 31
2x - 4y = -6
----------------
5x - 0y = 25

5x=25
x=5

So, you can solve for y.
3x + 4y = 31
3•5 + 4y = 31
15 + 4y = 31
4y = 31 - 15
4y = 16
y = 4

So the answer is:
x=5, y=4 , or, (5,4)

Answer 27

Thank you! Appreciate the help