Introduction to Using Formulas

The video tutorial explains how variables depend on each other using formulae, starting with simple examples like taxi cost and miles driven. It then covers converting sentences into formulae to calculate the perimeter of a square, emphasizing the importance of substitution and using brackets. The tutorial progresses to more complex formulae, demonstrating substitution and calculation with examples. Finally, it explains how to create and use formulae to find the area of a triangle, highlighting the need to protect substituted values with brackets and ensuring correct calculations.

In the formula C = 2 + 3M, what does the variable M represent?

• The cost of the taxi

• The number of miles driven

• The total distance traveled

• The time taken for the journey

How is the perimeter of a square calculated using its side length?

• By multiplying the side length by 2

• By adding the side length to 4

• By multiplying the side length by 4

• By squaring the side length

What is the result of substituting L = 5 into the formula P = 4L?

• P = 20

• P = 15

• P = 45

• P = 25

When substituting a negative value into a formula, what should you remember to do?

• Multiply the negative value by 2

• Use brackets to protect the negative value

• Add the negative value directly

• Ignore the negative sign

In the formula A = 15 - 2B, what is the value of A when B = -5?

• A = 5

• A = 25

• A = 35

• A = 15

How do you calculate the area of a triangle with a base of 8 cm and a height of 6 cm?

• Add base and height, then multiply by 2

• Multiply base and height, then multiply by 2

• Add base and height, then divide by 2

• Multiply base and height, then divide by 2

What is the area of a triangle with a base of 8 cm and a height of 6 cm?

• 24 cm²

• 48 cm²

• 36 cm²

• 12 cm²