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Find the distance between the st.line 4x...

Find the distance between the st.line `4x+3y-5=0` and the point `(-2,1)`.

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To find the distance between the straight line \(4x + 3y - 5 = 0\) and the point \((-2, 1)\), we can use the formula for the distance \(d\) from a point \((x_1, y_1)\) to a line given by the equation \(Ax + By + C = 0\): \[ d = \frac{|Ax_1 + By_1 + C|}{\sqrt{A^2 + B^2}} \] ### Step-by-step Solution: 1. **Identify the coefficients from the line equation**: The given line equation is \(4x + 3y - 5 = 0\). Here, we can identify: - \(A = 4\) - \(B = 3\) - \(C = -5\) 2. **Identify the coordinates of the point**: The point given is \((-2, 1)\). Thus, we have: - \(x_1 = -2\) - \(y_1 = 1\) 3. **Substitute the values into the distance formula**: Plugging in the values into the distance formula: \[ d = \frac{|4(-2) + 3(1) - 5|}{\sqrt{4^2 + 3^2}} \] 4. **Calculate the numerator**: First, calculate \(4(-2) + 3(1) - 5\): \[ 4(-2) = -8 \] \[ 3(1) = 3 \] \[ -8 + 3 - 5 = -10 \] Now take the absolute value: \[ | -10 | = 10 \] 5. **Calculate the denominator**: Now calculate \(\sqrt{A^2 + B^2}\): \[ A^2 = 4^2 = 16 \] \[ B^2 = 3^2 = 9 \] \[ A^2 + B^2 = 16 + 9 = 25 \] Therefore, \(\sqrt{25} = 5\). 6. **Calculate the distance**: Now substitute back into the formula: \[ d = \frac{10}{5} = 2 \] ### Final Answer: The distance between the line \(4x + 3y - 5 = 0\) and the point \((-2, 1)\) is \(2\).
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Knowledge Check

  • Find the distance between the lines 3x + 4y + 5=0 and 3x + 4y + 17=0 .

    A
    `(13)/(5)`
    B
    `(11)/(5)`
    C
    `(9)/(5)`
    D
    `(12)/(5)`
  • Find the distance of the line 4x+7Y+5=0 from the point (1,2) along the line 2x-y=0

    A
    `23/7 sqrt(5)sq units`
    B
    `23/(18) sqrt(5)sq`units
    C
    `23/8 sqrt5 sq`units
    D
    none of the above
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