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We can use the substitution when we need to isolate an equation. For example this two equations:

x+y=5

y=3

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you use substitution when a variable is already isolated and you use the value to solve.

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You use substitution when the value of a variable is given so you can replace the variable of the other equation and therefore get the answer.

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You use substitution as the best method to solve systems of equations when one of the variables is isolated. It is also easier when you just have to divide or multiply to get one of the variable isolated.

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The best time to use subsitution to solve system of equations is when one equation already has one variable isolated as in x=

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You use substitution as the best method to solve systems of equation when in one of the equations the variable is isolated.

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We use substitution when the set of equations they give have an equation with the variable isolated.

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When one of the linear equations in the system already has the variable isolated. Example: x=2x+3

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You use substitution when y or x is alone on one side.

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You should use substitution when one of the equations have an isolated variable.

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Substitution is the best method when one of the equations has an isolated variable.

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You use substitution best when you have an isolated variable.

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You use substitution when you have a system in which the variable is isolated

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you use substitution when the equation is not in slope-intercept form, as it is easier than the other methods and also when the variable is isolated

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When do you use substitution as the best method to solve systems of equations?