How can you decide whether to add or subtract to eliminate a variable in a linear system? can you explain it plz :)

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To eliminate variables you are technically supposed to add but with the correct circumstances you can obviously subtract too. You want them to cancel out and equal 0. For example: 1+(-1)=0, x+(-x)=0, 6y+(-6y)=0. Make sure you have a positive and a negative variable and that they have the same coefficient so they will cancel out:)

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