Question

What is the value of 5n-3 when n=5?

Answer 1

22

Explanation:

We are given the expression:—

`\displaystyle \large{5n-3}`

When n = 5, substitute/change n to 5:—

`\displaystyle \large{5(5)-3}`

Evaluate:—

`\displaystyle \large{25-3=\boxed{22}}`

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Summary

Substitution

Changing or replacing from a term to another terms/expression is called substitution.

Examples:—

If we are given the expression
`\displaystyle \large{2y-1}` and we want to find the value when y = 4, simply replace y-term to 4.

`\displaystyle \large{2(4)-1=8-1=\boxed{7}}`

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