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Find the point of intersection of the st...

Find the point of intersection of the straight lines :
`(i) 2x+3y-6=0`, `3x-2y-6=0`
`(ii) x=0`, `2x-y+3=0`
`(iii) (x)/(3)-(y)/(4)=0`, `(x)/(2)+(y)/(3)=1`

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The correct Answer is:
To find the points of intersection of the given pairs of straight lines, we will solve each pair of equations step by step. ### (i) Find the point of intersection of the lines: **Equations:** 1. \( 2x + 3y - 6 = 0 \) 2. \( 3x - 2y - 6 = 0 \) **Step 1:** Rewrite the equations in standard form. - From the first equation: \( 2x + 3y = 6 \) - From the second equation: \( 3x - 2y = 6 \) **Step 2:** Multiply the first equation by 3 and the second equation by 2 to eliminate \(x\). - First equation: \( 3(2x + 3y) = 3(6) \) \( 6x + 9y = 18 \) - Second equation: \( 2(3x - 2y) = 2(6) \) \( 6x - 4y = 12 \) **Step 3:** Now, subtract the second equation from the first: \( (6x + 9y) - (6x - 4y) = 18 - 12 \) This simplifies to: \( 13y = 6 \) So, \( y = \frac{6}{13} \) **Step 4:** Substitute \( y \) back into one of the original equations to find \( x \). Using the first equation: \( 2x + 3\left(\frac{6}{13}\right) = 6 \) \( 2x + \frac{18}{13} = 6 \) Multiply through by 13 to eliminate the fraction: \( 26x + 18 = 78 \) So, \( 26x = 60 \) Thus, \( x = \frac{60}{26} = \frac{30}{13} \) **Final Answer for (i):** The point of intersection is \( \left(\frac{30}{13}, \frac{6}{13}\right) \). ### (ii) Find the point of intersection of the lines: **Equations:** 1. \( x = 0 \) 2. \( 2x - y + 3 = 0 \) **Step 1:** Substitute \( x = 0 \) into the second equation: \( 2(0) - y + 3 = 0 \) This simplifies to: \( -y + 3 = 0 \) Thus, \( y = 3 \) **Final Answer for (ii):** The point of intersection is \( (0, 3) \). ### (iii) Find the point of intersection of the lines: **Equations:** 1. \( \frac{x}{3} - \frac{y}{4} = 0 \) 2. \( \frac{x}{2} + \frac{y}{3} = 1 \) **Step 1:** Rewrite the first equation: \( \frac{x}{3} = \frac{y}{4} \) Cross-multiplying gives: \( 4x = 3y \) Thus, \( y = \frac{4}{3}x \) **Step 2:** Substitute \( y \) into the second equation: \( \frac{x}{2} + \frac{4}{3} \cdot \frac{x}{3} = 1 \) This simplifies to: \( \frac{x}{2} + \frac{4x}{9} = 1 \) Finding a common denominator (18): \( \frac{9x}{18} + \frac{8x}{18} = 1 \) Thus, \( \frac{17x}{18} = 1 \) So, \( x = \frac{18}{17} \) **Step 3:** Substitute \( x \) back to find \( y \): Using \( y = \frac{4}{3}x \): \( y = \frac{4}{3} \cdot \frac{18}{17} = \frac{72}{51} = \frac{24}{17} \) **Final Answer for (iii):** The point of intersection is \( \left(\frac{18}{17}, \frac{24}{17}\right) \). ### Summary of Answers: 1. \( \left(\frac{30}{13}, \frac{6}{13}\right) \) 2. \( (0, 3) \) 3. \( \left(\frac{18}{17}, \frac{24}{17}\right) \)
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Knowledge Check

  • Point of intersection of two lines 3x+2y-7=0 and 5x+3y-11=0 is

    A
    (1,2)
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    C
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    D
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