Introduction to Formulas and Substitution in Mathematics

The video tutorial explains how to calculate the value of variables using formulas. It covers the concept of substitution, where letters in formulas are replaced with given values, and demonstrates this with examples. The tutorial also discusses changing the subject of a formula by rearranging it, using inverse operations, and introduces factorizing when variables appear multiple times in a formula.

What is the subject of a formula?

• The constant in the equation

• The number of variables in the formula

• The variable being solved for

• The operation used in the formula

How do you substitute a value into a formula?

• Replace the variable with a number and use brackets

• Multiply the value by the formula

• Divide the formula by the value

• Add the value to the formula

What is the perimeter of a square with a side length of 5 cm?

• 10 cm

• 15 cm

• 20 cm

• 25 cm

What is the first step in changing the subject of a formula?

• Rearrange the formula to isolate the desired variable

• Multiply both sides by a variable

• Add a constant to both sides

• Subtract a constant from both sides

When a variable appears more than once in a formula, what technique can be used?

• Substitution

• Factorizing

• Simplification

• Division