The points P(0, 2) and Q(3, 7) lie on the line l_1, as shown in Figure 2 - Edexcel - A-Level Maths Pure - Question 11 - 2016 - Paper 1
Question 11
The points P(0, 2) and Q(3, 7) lie on the line l_1, as shown in Figure 2.
The line l_1 is perpendicular to l_2, passes through Q and crosses the x-axis at the point... show full transcript
Worked Solution & Example Answer:The points P(0, 2) and Q(3, 7) lie on the line l_1, as shown in Figure 2 - Edexcel - A-Level Maths Pure - Question 11 - 2016 - Paper 1
Step 1
an equation for l_2, giving your answer in the form ax + by + c = 0, where a, b and c are integers
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Answer
To find the equation of line l_2, we first need to determine the slope of line l_1. The coordinates of points P and Q can be used to calculate this:
Calculate the slope (m) of line l_1:m=x2−x1y2−y1=3−07−2=35
Determine the slope of l_2: Since l_1 and l_2 are perpendicular, the product of their slopes is -1:
m_{l_2} = -\frac{3}{5}$$
Use point-slope form to find the equation of l_2: Using point Q(3, 7):
Convert to standard form ax + by + c = 0:
Multiply through by 5:
3x + 5y - 44 = 0$$
Therefore, the equation of line l_2 is:
$$3x + 5y - 44 = 0$$
Step 2
the exact coordinates of R
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Answer
To find the coordinates of point R, we set y = 0 in the equation of line l_2:
**Substitute y = 0 into the equation: **
3x - 44 = 0 \
3x = 44 \
x = \frac{44}{3}$$
Thus, the coordinates of R are:R(344,0)
Step 3
the exact area of the quadrilateral ORQP, where O is the origin
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Answer
To find the area of the quadrilateral ORQP, we can divide it into two triangles: OQP and ORP.
Coordinates of points:
O(0, 0)
P(0, 2)
Q(3, 7)
R(\frac{44}{3}, 0)
Area of triangle OQP:
Using the formula for the area of a triangle:
A=21∣x1(y2−y3)+x2(y3−y1)+x3(y1−y2)∣
where (x_1, y_1), (x_2, y_2), and (x_3, y_3) are the coordinates of points O, Q, and P:
AOQP=21∣0(7−2)+3(2−0)+0(0−7)∣=21∣0+6+0∣=3
Area of triangle ORP:
Using the same formula:
AORP=21∣0(2−0)+344(0−2)+0(0−2)∣=21∣0−388+0∣=344
Total Area:Atotal=AOQP+AORP=3+344=39+344=353
Therefore, the exact area of quadrilateral ORQP is:
353