Math Problem Statement

What are the coordinates of the point on the x-axis whose distance from the point B (-3, 4) are in the ratio 1: 2? Question 13Answer a. (9, 0) b. (35, 0) c. (7, 6) d. (-9, 0)

Solution

To find the coordinates of the point on the x-axis, we can use the section formula. The section formula allows us to find the coordinates of a point dividing a line segment in a given ratio.

Problem Breakdown:

  • The point B(3,4)B(-3, 4) is given.
  • We need to find the point P(x,0)P(x, 0) on the x-axis, where the distance between PP and BB is in the ratio 1:2.
  • The point P(x,0)P(x, 0) divides the segment OBOB (where OO is the origin (0,0)(0, 0)) in the ratio 1:2.

Step 1: Use the section formula

The formula to find the coordinates of a point dividing a line segment in the ratio m:nm:n is:

P(nx1+mx2m+n,ny1+my2m+n)P\left( \frac{n x_1 + m x_2}{m+n}, \frac{n y_1 + m y_2}{m+n} \right)

where (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) are the coordinates of the points that the segment joins, and m:nm:n is the given ratio.

Step 2: Apply to this case

  • The coordinates of OO are (0,0)(0, 0).
  • The coordinates of BB are (3,4)(-3, 4).
  • The ratio m:n=1:2m:n = 1:2.

Using the section formula, the coordinates of the point P(x,0)P(x, 0) dividing OBOB in the ratio 1:2 are:

x=2(0)+1(3)1+2=33=1x = \frac{2(0) + 1(-3)}{1 + 2} = \frac{-3}{3} = -1

y=2(0)+1(4)1+2=431.33y = \frac{2(0) + 1(4)}{1 + 2} = \frac{4}{3} \approx 1.33

Since we're looking for a point on the x-axis, the correct answer should be (1,0)(-1, 0).

So the coordinates of the point are (-1, 0). None of the options match this exactly. There could be an error in the choices listed or in interpreting the conditions

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Section Formula

Formulas

Section formula: P(x, y) = ((n * x1 + m * x2) / (m + n), (n * y1 + m * y2) / (m + n))

Theorems

Section formula

Suitable Grade Level

Grades 8-10