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When you have a system of equations and you can solve for one in terms of th others and then replace it in the other equations that is substitution.

x+y=15

x-y=1

well the second one can be x=1+y

x+y=15 then can be (1+y)+y=15 by substitution.

1+2y=15

2y=14

y=7

Then x+7=15

x=8

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Q: What is called Substitution method?
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