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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(1) Answers

Pinkpanther25

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:)