The image of origin in the line \(\mathrm{x}+4 \mathrm{y}=1 \mathrm{is}\) (a) \([(2 / 17),-(8 / 17)]\) (b) \([-(2 / 17),-(8 / 17)]\) (c) \([-(2 / 17),(8 / 17)]\) (d) \([(2 / 17),(8 / 17)]\)

Short Answer

Expert verified
The image of the origin in the line \(x + 4y = 1\) is \[-(2/17), (8/17)\] or option (c).

Step by step solution

01

Find the distance between the origin and the line

To find the distance between the origin (0, 0) and the line \(x + 4y = 1\), we use the point to line distance formula: \[d = \frac{|Ax + By + C|}{\sqrt{A^2 + B^2}}\] where the line is given in the form Ax + By + C = 0 and (x, y) is the point. For our line, A = 1, B = 4, C = -1, x = 0, and y = 0. Plugging in these values, we get: \[d = \frac{|(1)(0) + (4)(0) + (-1)|}{\sqrt{(1)^2 + (4)^2}} = \frac{1}{\sqrt{17}}\]
02

Determine the point that is equidistant from the origin on the opposite side of the line

To find this point, we can imagine moving from the origin in the opposite direction of the normal vector of the line by a distance equal to the distance between the origin and the line. The normal vector of the line is given by the coefficients of x and y in the equation of the line: \( \begin{pmatrix} 1 \\ 4 \end{pmatrix}\). We can calculate the normalized normal vector by dividing each component of the normal vector by the length of the normal vector: \[\begin{pmatrix} \frac{1}{\sqrt{17}} \\ \frac{4}{\sqrt{17}} \end{pmatrix}\] Now, we need to find the point which is twice the calculated distance away from the origin in the direction opposite of the normalized normal vector: \[\begin{pmatrix} 0 \\ 0 \end{pmatrix} - 2 \cdot \frac{1}{\sqrt{17}} \cdot \begin{pmatrix} \frac{1}{\sqrt{17}} \\ \frac{4}{\sqrt{17}} \end{pmatrix} = \begin{pmatrix} - \frac{2}{17} \\ - \frac{8}{17} \end{pmatrix}\] Comparing this point to the options given in the exercise, we see that it matches the point of option (c). So the image of the origin in the line \(x + 4y = 1\) is \[\boxed{[-(2/17), (8/17)]}\] or option (c).

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