With whatever method is easiest...substitution or elimination?

You can also cancel -y and +y just by adding this two equations. so when you add it just left with:

4x=4

x=1

then plug back 1 to one of the equation.

1-y=6

1-6=y

y=-5

With whatever method is easiest...substitution or elimination?

Tutors, sign in to answer this question.

Kiana V. | Let's Develop Your Math and Art Skills!Let's Develop Your Math and Art Skills!

You can also cancel -y and +y just by adding this two equations. so when you add it just left with:

4x=4

x=1

then plug back 1 to one of the equation.

1-y=6

1-6=y

y=-5

Margery B. | Your best bet for Graphic Design!!Your best bet for Graphic Design!!

I would solve for x with the first equation, then use that to solve for y in the second, then check by inputting values.

3x+y=-2

x-y=6

x=6+y

then...

3(6+y)+y=-2

18+3y+y=-2

18+4y=-2

4y=-20

y=-5

So..

3x+-5=-2

3x=3

x=1

3(1) + -5 = -2 ... yes! :)

In this scenario, the goal of finding the values of both x and y the fastest is to find which variable will be easiest to solve and determine its values, which in this case must be x because you can use elimination or substitution to derive at x.

Elimination Process:

3x+y=2 and x-y=6 (adding them together)

4x=8 --> x=2

2-y=6 --> (through common sense) y=-4 since 2-(-4)=2+4=6

Test the solution witht he other equation:

3(2)+(-4)=6-4=2

Substitution Method: (as written above margery b.)

The key here Angelica is to use your instinct and determine what variable is best to be eliminated first so that you are left with only one variable to solve.

If you need any further help on your math, please check my profile or shoot me another email for tons of mathematical magics.

-Andy Lai "If adversary smiles, military people smiles back"

I prefer Elimination myself although the beauty of math allows more than one method with the same result. Please note that Andy's answer is only different because he had the 1st equation wrong.

Already have an account? Log in

By signing up, I agree to Wyzant’s terms of use and privacy policy.

Or

To present the tutors that are the best fit for you, we’ll need your ZIP code.

Your Facebook email address is associated with a Wyzant tutor account. Please use a different email address to create a new student account.

Good news! It looks like you already have an account registered with the email address **you provided**.

It looks like this is your first time here. Welcome!

To present the tutors that are the best fit for you, we’ll need your ZIP code.

Please try again, our system had a problem processing your request.

## Comments