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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

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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:

  1. Calculate the slope (m) of line l_1: m=y2y1x2x1=7230=53m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{7 - 2}{3 - 0} = \frac{5}{3}

  2. 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}$$
  3. Use point-slope form to find the equation of l_2: Using point Q(3, 7):

    y - 7 = -\frac{3}{5} (x - 3)$$ Rewriting this: $$y - 7 = -\frac{3}{5}x + \frac{9}{5} \ y = -\frac{3}{5}x + \frac{44}{5}$$
  4. 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:

  1. **Substitute y = 0 into the equation: ** 3x - 44 = 0 \ 3x = 44 \ x = \frac{44}{3}$$
  2. Thus, the coordinates of R are: R(443,0)R(\frac{44}{3}, 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.

  1. Coordinates of points:

    • O(0, 0)
    • P(0, 2)
    • Q(3, 7)
    • R(\frac{44}{3}, 0)
  2. Area of triangle OQP: Using the formula for the area of a triangle: A=12x1(y2y3)+x2(y3y1)+x3(y1y2)A = \frac{1}{2} | x_1(y_2 - y_3) + x_2(y_3 - y_1) + x_3(y_1 - y_2) | where (x_1, y_1), (x_2, y_2), and (x_3, y_3) are the coordinates of points O, Q, and P: AOQP=120(72)+3(20)+0(07)=120+6+0=3A_{OQP} = \frac{1}{2} | 0(7 - 2) + 3(2 - 0) + 0(0 - 7) | = \frac{1}{2} | 0 + 6 + 0 | = 3

  3. Area of triangle ORP: Using the same formula: AORP=120(20)+443(02)+0(02)=120883+0=443A_{ORP} = \frac{1}{2} | 0(2 - 0) + \frac{44}{3}(0 - 2) + 0(0 - 2) | = \frac{1}{2} | 0 - \frac{88}{3} + 0 | = \frac{44}{3}

  4. Total Area: Atotal=AOQP+AORP=3+443=93+443=533A_{total} = A_{OQP} + A_{ORP} = 3 + \frac{44}{3} = \frac{9}{3} + \frac{44}{3} = \frac{53}{3} Therefore, the exact area of quadrilateral ORQP is: 533\frac{53}{3}

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