GCSE Secondary Maths Age 13-17 - Graphs: y = mx + c - Explained

The video tutorial explains how to find the equation of a straight line using the formula y=mx+c. It covers identifying the y-intercept and calculating the gradient, then combining these to form the line equation. The tutorial also discusses the marking scheme for such questions and emphasizes the importance of understanding the line equation for exams.

What does the 'm' represent in the equation y = mx + C?

• The y-intercept

• The gradient or slope

• The x-intercept

• The constant term

If a line cuts the y-axis at -6, what is the value of C in the equation y = mx + C?

• 6

• 0

• 1

• -6

How do you calculate the gradient of a line?

• By multiplying the rise and run

• By dividing the rise by the run

• By dividing the run by the rise

• By adding the rise and run

What is the final equation of the line if the gradient is 3 and the y-intercept is -6?

• y = -3x - 6

• y = -3x + 6

• y = 3x - 6

• y = 3x + 6

Which of the following is NOT a part of the marking scheme for the straight line equation question?

• Forming the final equation

• Correctly identifying the x-intercept

• Correctly identifying the y-intercept

• Correctly identifying the gradient