Graphs: Finding the Point of Intersection between a Line and the X-axis

The video tutorial explains how to find the point where a line perpendicular to another crosses the X-axis. It starts by introducing the problem and the equations of the lines involved. The tutorial then details the calculation of the gradient for the perpendicular line using a specific formula. It proceeds to find the Y-intercept by substituting known coordinates into the equation. The tutorial includes a visualization of the line on a graph and concludes by solving for the X-axis intersection point. Finally, it outlines the marking scheme for the problem.

What is the equation of the straight line L1?

How do you calculate the gradient of line L2 given that it is perpendicular to line L1?

What coordinates does line L2 pass through?

How do you find the value of C in the equation of line L2?

What is the final equation of line L2 after calculating C?

Where does line L2 cross the X axis?

What are the coordinates of the point where line L2 crosses the X axis?