Question

i need help!!!!!!!

Answer 1

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?

2x + y = 8
-x - 3y = -12

3y + 12

-3y + 12

3y - 12

-3y - 12

Answer 2

We need to solve the second equation for x.

Start with the second equation. You need to isolate x, so first, add 3y to both sides.
What do you get?

Answer 3

B

Answer 4

@ineedthathelp

Answer 5

@INeedTheHelp

Answer 6

You need help!!!!!

Answer 7

We're here to help!!!!

Answer 8

Just don't expect the question without any work!!!

Answer 9

Because you won't learn anything otherwise!!!

Answer 10

And your marks will be bad then!!!!

Answer 11

haha ik i think the awnser is b

Answer 12

Would you like to share how you got it? :P

Answer 13

use elmintaion method

Answer 14

who ever helps me i will give them a medal

Answer 15

b is correct

Answer 16

u sure? cause i feel like the awnser is D

Answer 17

nvm it is D

Answer 18

How about doing what I suggested above. If you solve the problem one step at a time, it will make sense.

Answer 19

idk how to solve it like whats the first step

Answer 20

Did you read my response above? To isolate x, start by adding 3y to both sides.

Answer 21

-x - 3y = -12
+3y +3y
-----------------------
-x = 3y - 12

You see how 3y is added to both sides?

Answer 22

so it would be 3y - 12

Answer 23

One more step.
Now we have -x = 3y - 12
We only have one variable on the left side, but we have -x instead of x.

Answer 24

We want x on the left side. We multiply the left side by -1, since -1 * (-x) = x.
That will give us x on the left side which is what we want.
In an equation, we need to do the same thing to both sides.
That means we must multiply both sides by -1.

Answer 25

(-1) * (-x) = (-1) * (3y - 12)

On the left side we get just x.
On the right side, we must distribute the -1.

Answer 26

(-1) * (-x) = (-1) * (3y - 12)
x = -3y + 12

Notice, x ended up being -3y + 12, not -3y - 12, so the answer is B, not D.

Answer 27

okay thank you! can u help me with one two more?? @mathstudent55

Answer 28

Solve the following system of equations. Please show your work to receive full credit.
x - y = 10
2x + y = 2

Part 2:
Explain which method you chose to solve the system and why you felt it was the best choice.

Answer 29

@Mertsj can u help

Answer 30

@mago7577 can u help me pleaseeee

Answer 31

@bibby can you help pleaseee

Answer 32

1) x - y = 10
2) 2x + y = 2

take equation 1. isolate 1 of the variables

Answer 33

i dont get it
y= 10 like that cause u said isolate the varible

Answer 34

@bibby

Answer 35

@Taylor<3sRin

Answer 36

This system can be solved most easily by the addition method.

Answer 37

i dont get it though

Answer 38

I'll explain.

x - y = 10
2x + y = 2

Notice that in the first equation you have -y, and in the second equation you have y. Since -y + y = 0, by simply adding the equations you eliminate y. Then you can solve for x.

Answer 39

x - y = 10
2x + y = 2
---------------(add equations)
3x = 12

The y terms added up to zero, so they were eliminated.
You have a simple equation in just x:

3x = 12

Divide both sides by 3, to get
x = 4

Answer 40

Now that we know that x = 4, we substitute that value of x in one of the original equations to solve for y.

x - y = 10

4 - y = 10

Subtract 4 from both sides:

-y = 6

Multiply both sides by -1:

y = -6

Solution is: x = 4 and y = -6

Answer 41

so i would say i choosed the adition method

Answer 42

@mathstudent55

Answer 43

Correct. The reason for choosing the addition method is that it was the easiest method to use since the y's were eliminated easily.

Answer 44

can u help me with anthoer one?

Answer 45

Which point lies in the solution set for the following system of inequalities?
y > x + 4
y > -2x + 2

(-4, 0)

(-3, 2)

(2, -1)

(0, 6)

Answer 46

@mathstudent55

Answer 47

This is easier than it looks.
Start with choice 1. (-4, 0)

Replace x with -4 and y with 0 in the first equation.
If the statement is false, move on to the next choice.
If the statement is true, then do the same in the second equation. If it is also true, it is a solution.
If replacing x and y with the values of each choice gives you a false statement, then that is not a solution.

Answer 48

Here are the two inequalities after replacing x and y with the first point:

0 > -4 + 4

Is this true or false?

0 > -2*(-4) + 2

Is this true or false?

Answer 49

False @mathstudent55

Answer 50

Correct.
Now move on to the second choice.

Answer 51

that one false too

Answer 52

awnser is C

Answer 53

i think

Answer 54

@mathstudent55

Answer 55

Correct.
Move on to choice 3.

Answer 56

that is correct @mathstudent55

Answer 57

It seems like you don't care about getting the answer, and you just want someone to give you it without any work.