The following example shows how to fi nd the endpoint, without using the coordinate plane.
Worked example 2 The point M is the midpoint of the line segment [ PQ ]. The coordinates of P are (–3, 1) and the coordinates of M are (1
Solution
__ 2 , 3
__ 2 ). Find the coordinates of Q .
Practice questions 9.1 1.
(i)
Identify the coordinates of each of the points shown on the Cartesian plane on the right. Note: Not all letters of the alphabet are represented by a point
(ii) State in which quadrant (fi rst, second, third or fourth) the following points are found.
(a) E (b) F (c) P (d) N
2. Draw a coordinate plane on graph paper and plot each of the points below.
(i) A(1, 1) (ii) B (–8, 3) (iii) C (1, –4) (iv) D (–5, –4) (v) E (0, 0)
160 Linking Thinking 2
(vi) F (–5, –6) (vii) G (–3, 10) (viii) H (7 ⋅ 5, –2) (ix) I (9, 0) (x) J (0, 3 ⋅ 5)