GCSE Secondary Maths Age 13-17 - Algebra: Subject of a Formula - Explained

The video tutorial explains how to make T the subject of the formula y = T/3 - 2A. It guides through the process of isolating T by adding 2A to both sides and then multiplying by 3. The final answer is T = 3(y + 2A). The tutorial also discusses the marking scheme, emphasizing that expanding the brackets is unnecessary for extra marks.

What is the initial formula given in the problem?

• y = T / 3 - 2A

• y = T - 3 / 2A

• y = T * 3 + 2A

• y = T + 3 * 2A

What is the first step to isolate T in the equation?

• Subtract 2A from both sides

• Add 2A to both sides

• Divide both sides by 3

• Multiply both sides by 3

After adding 2A to both sides, what does the equation become?

• y = T * 3 - 2A

• y - 2A = T / 3

• y + 2A = T / 3

• y = T / 3 + 2A

What operation is performed to completely isolate T?

• Add 3 to both sides

• Multiply both sides by 3

• Subtract 3 from both sides

• Divide both sides by 3

What is the final expression for T?

• T = 3(y - 2A)

• T = y + 2A / 3

• T = 3(y + 2A)

• T = y / 3 + 2A