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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

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Addition: when the variables have same coefficients opposite signs

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

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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.

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

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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

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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.

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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

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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.

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

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

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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.

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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.

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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.

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