Question

what is substitute identity

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Answer 1

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the free encyclopedia. Substitution is a fundamental concept in logic. A substitution is a syntactic transformation on formal expressions. To apply a substitution to an expression means to consistently replace its variable, or placeholder, symbols by other expressions.....!!!

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Answer 2

Answer:

In this identity we find the value of one variable and we put it in other.

eg. we are given two equations,

x-2y=7 -(i)

or x=7-2y -(iii)

x-y=10 -(ii)

now we substitute value of (iii) in (ii) we get, 7-2y-y=10

Now solve it further.

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