## Tuesday, 14 July 2015

### Assignment 9.5 (Tier C) Questions

Question 4

How to approach this question?

1. What is the info available in the question?
• 2 points given, although one of them is unknown, P (x, y).
2. What would help us to link 2 points and the gradient together?
• The formula!
• After substituting the points and the gradient into the formula, we will get an equation with x and y.
• Next, we re-arrange the terms in a form that we are familiar with: Y = mX + c

By Malcolm

By Tjin Yao

By Benedict

Question 5

How to approach this question?

1. What is the info available in the question?

• We have an equation with incomplete information: we have the y-intercept, but gradient is unknown (m).
• We are given 3 points. Among them, we have A (6, 11)
• We can substitute the coordinates of into the equation to find m
2. Since we now know the gradient m, and we have a known point A

• We can use 2 points A and P to find gradient.
• Using the formula for gradient, we substitute the value m and the points A (6, 11) and P (a, 16). There, we will be able to find the value a.
• Similarly, we substitute the value and the points (6, 11) and Q (2b) into the gradient formula to find value of b.

By Malcolm

by Kar Kit