In this video, the steps to solve question 15 in grade 9 practice in finding the y coordinate of a point on a line and the equation of a line given the slope and two points.
Question:
a) Find the value of the parameter \( s \) so that the slope of the line through the points \( (-2 , s) \) and \( (-4,5) \) is equal to \( -1 \).
b) Find the equation of the line