Exit Ticket by Barbara Amador

Ms. Barbara

bamador — 2013-12-02 15:33:07 UTC

How do you know when to use addition or subtraction when solving systems of linear equations by elimination?

Alejandra Garcia

2013-12-02 16:33:53 UTC

If the x or y have the same coefficient and these are opposites you are to solve the system by adding, yet if the coefficient is the same but their not opposites you are to solve this system by subtraction.

Natalie Blandon

2013-12-02 16:34:55 UTC

You know when to use addition because there are two different coefficients are the same but have different signs. You know to use subtraction because there are two coefficients that are the same but dont have different signs.

Jae Cheol Lee

2013-12-02 16:35:30 UTC

You can know which equation should use addition or subtraction by looking if the both equations has the same integers and the same coefficient then it would be subtraction

Addition would be when the both equations has different coefficient and opposite integers and you would need to multiply by -1 on an equation to subtract the both.

Ivanna

2013-12-02 16:36:09 UTC

It's addition when you have opposites and it subtraction when you have the same coefficient,

Camila Mencia

2013-12-02 16:36:37 UTC

You use addition when you have same coefficient opposite signs. You use subtraction when you have the same coefficient and same signs.

Víctor Hondoy

2013-12-02 16:37:21 UTC

You use addition when you have the opposite signs in the equations and if they have the same coefficient you use addition. You use subtraction when you have the same signs on the equations so both of them can cancel themselves and therefore, they will be able to isolate the variable which will guide to the number that is represented by x or y.

Jorge Huerta

bhuerta — 2013-12-02 16:38:10 UTC

Addition is used when there are opposites in the equations, for example:

x+3y=12

-x+2y=4

Subtraction is used when there are no opposites and subtraction is needed to make opposites, for example:

3x+4y=3

3x+y=5

Ji Eun Kim

2013-12-02 16:38:47 UTC

When the system of equations have at least one variable that has the same coefficient and opposite sign, we use addition. When the system of equations have at least one variable that has the same coefficient but the same sign, you use substraction.

Alejandro Escobar

2013-12-02 16:38:52 UTC

Addition is used when both variables have the same coefficient and opposites

Subtraction is used when both variables have the same coefficient and same sign

Maggie Huang

2013-12-02 16:38:56 UTC

addition is used when the variables have opposite coeficient and substration is use whenn the variables have the same coeficient

Mariela Guaadamuz

2013-12-02 16:39:57 UTC

Addition is used when the same variable in both equations are opposite. Subtraction is used when the the same variable in both equation have the same coefficient but are not opposite.

Lauren Fonseca

2013-12-02 16:40:42 UTC

Addition: when the variables have same coefficients opposite signs

Substraction: when the variables have the same coefficient and same sign

Karla Guevara

2013-12-02 16:42:57 UTC

You use addition when solving systems of linear equations by elimination when the varibale has the oppostie sign and the same coefficient. You use substraction when solving systems of linear equations by elimination when the variable has the same sign and same coefficient