Substitution

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What is substitution in mathematics?

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Substitution is a method of replacing a variable with a number or another expression to simplify or solve an equation.

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What does it mean to evaluate an expression?

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To evaluate an expression means to calculate its value by substituting the variables with their respective numbers.

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What is the first step in solving an equation?

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The first step is to isolate the variable on one side of the equation.

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What is an equation?

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An equation is a mathematical statement that asserts the equality of two expressions.

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How do you check if your solution to an equation is correct?

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You substitute your solution back into the original equation to see if both sides are equal.

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What is the purpose of using parentheses in mathematical expressions?

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Parentheses indicate which operations should be performed first in an expression.