GCSE Secondary Maths Age 13-17 - Graphs: Straight Line Graphs - Explained

The video tutorial explains how to find the equation of a line parallel to another given line. It starts by identifying the importance of parallel lines having the same gradient. The teacher demonstrates how to calculate the gradient using a right-angle triangle and explains the general form of a straight line equation, y = mx + c. The tutorial then shows how to find the y-intercept using a given point and finalizes the equation of the parallel line. The video concludes with a discussion on the mark scheme and emphasizes the importance of understanding gradients and line equations.

What is the relationship between lines L1 and L2?

• L2 intersects L1

• L2 is parallel to L1

• L2 is perpendicular to L1

• L2 is the same as L1

How do you determine the gradient of a line?

• By calculating the change in y over the change in x

• By counting the number of squares the line crosses

• By finding the midpoint of the line

• By measuring the length of the line

What is the gradient of line L1?

• 1/4

• 1/2

• 4

• 2

What is the general form of a straight line equation?

• Y = MX + C

• Y = X + C

• Y = C

• Y = MX - C

What is the y-intercept of line L2?

• 1/2

• -5

• 0

• 5

What is the equation of line L2?

• y = 1/2x + 5

• y = 2x - 5

• y = x - 5

• y = 1/2x - 5

What is the importance of knowing the gradient when dealing with parallel lines?

• Parallel lines have the same gradient

• It helps in finding the length of the line

• It is not important

• It determines the angle between the lines