Here is a sketch of the line L - Edexcel - GCSE Maths - Question 14 - 2021 - Paper 2
Question 14
Here is a sketch of the line L.
The points P(-6, 0) and Q(0, 3) are points on the line L.
The point R is such that PQR is a straight line and PQ:QR = 2:3.
(a) Find... show full transcript
Worked Solution & Example Answer:Here is a sketch of the line L - Edexcel - GCSE Maths - Question 14 - 2021 - Paper 2
Step 1
(a) Find the coordinates of R.
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Answer
To find the coordinates of point R, we first need to determine the distance between points P and Q.
Calculate the distance PQ: Using the distance formula:
d=(x2−x1)2+(y2−y1)2 where P(-6, 0) and Q(0, 3).
PQ=(0−(−6))2+(3−0)2=(6)2+(3)2=36+9=45=35
Find the distances based on the ratio: Since PQ : QR = 2 : 3, we find QR:
Let the total distance be divided into 5 equal parts (2 + 3).
Find the lengths:
Length of PQ:
PQ=52×(35)=565
Length of QR:
QR=53×(35)=595
Calculate the coordinates of R: We can find R by moving from Q to R at the coordinates Q(0, 3).
To find coordinates of R, we need to find the direction vector of PQ, which is:
Direction from P to Q:
(0−(−6),3−0)=(6,3)
Normalize this direction vector:
V=(62+32)(6,3)=35(6,3)
Moving from Q(0, 3) towards R in the same direction: