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Two points on a line are such that their...

Two points on a line are such that their Y co-ordinates is `(3 + sqrt(2))` times the X co-ordinate. Then the line

A

has negative slope

B

passes through the origin

C

is parallel to the X-axis

D

is parallel to the Y-axis

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The correct Answer is:
To solve the problem, we need to find the equation of the line given that the y-coordinates of two points on the line are `(3 + sqrt(2))` times their respective x-coordinates. ### Step-by-Step Solution: 1. **Define the Points**: Let the two points on the line be \( A(x_1, y_1) \) and \( B(x_2, y_2) \). 2. **Express y-coordinates**: According to the problem, the y-coordinates can be expressed as: \[ y_1 = (3 + \sqrt{2}) x_1 \] \[ y_2 = (3 + \sqrt{2}) x_2 \] 3. **Equation of the Line**: The general equation of a line can be written as: \[ y = mx + c \] where \( m \) is the slope and \( c \) is the y-intercept. 4. **Substituting Points into the Line Equation**: Since both points lie on the line, they must satisfy the line equation. Thus, we can write: \[ (3 + \sqrt{2}) x_1 = mx_1 + c \quad \text{(Equation 1)} \] \[ (3 + \sqrt{2}) x_2 = mx_2 + c \quad \text{(Equation 2)} \] 5. **Subtracting the Equations**: To eliminate \( c \), we subtract Equation 2 from Equation 1: \[ (3 + \sqrt{2}) x_1 - (3 + \sqrt{2}) x_2 = mx_1 - mx_2 \] This simplifies to: \[ (3 + \sqrt{2})(x_1 - x_2) = m(x_1 - x_2) \] 6. **Finding the Slope (m)**: If \( x_1 \neq x_2 \), we can divide both sides by \( (x_1 - x_2) \): \[ m = 3 + \sqrt{2} \] 7. **Finding the y-intercept (c)**: Now we substitute \( m \) back into one of the original equations to find \( c \). Let's use Equation 1: \[ (3 + \sqrt{2}) x_1 = (3 + \sqrt{2}) x_1 + c \] Rearranging gives: \[ c = 0 \] 8. **Final Equation of the Line**: Now we can write the equation of the line: \[ y = (3 + \sqrt{2}) x \] ### Conclusion: Since the y-intercept \( c = 0 \), the line passes through the origin. ### Answer: The line passes through the origin (Option B).
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