Jia Earn Lim's answer to charissa's Secondary 4 A Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Jia Earn Lim
Jia Earn Lim's answer
96 answers (Tutor Details)
1st
Hope this helps :) Remember dy/dx provides the gradient of tangent of the graph for all values of x, so we can substitute the x-coordinate of the 2 points given to calculate its gradient of tangent.