What is the ratio in which the line segment joining (2,-3) and (5, 6) is divided by x-axis?
Question
What is the ratio in which the line segment joining (2,-3) and (5, 6) is divided by x-axis?
Solution 1
To find the ratio in which the line segment joining the points (2,-3) and (5,6) is divided by the x-axis, we need to find the point where the line segment intersects the x-axis.
The equation of the line passing through two points (x1, y1) and (x2, y2) is given by:
(y - y1) = [(y2 - y1) / (x2 - x1)] * (x - x1)
Here, (x1, y1) = (2, -3) and (x2, y2) = (5, 6).
So, the equation of the line is:
(y + 3) = [(6 - (-3)) / (5 - 2)] * (x - 2)
=> (y + 3) = 3 * (x - 2)
=> y = 3x - 6 - 3
=> y = 3x - 9
The x-axis is the line y = 0. So, the x-coordinate of the point where the line intersects the x-axis is found by setting y = 0 in the equation of the line:
0 = 3x - 9
=> 3x = 9
=> x = 3
So, the line segment intersects the x-axis at the point (3, 0).
Now, we find the distances from the point (3, 0) to the points (2, -3) and (5, 6) to find the ratio.
The distance between two points (x1, y1) and (x2, y2) is given by:
sqrt[(x2 - x1)^2 + (y2 - y1)^2]
So, the distance from (3, 0) to (2, -3) is:
sqrt[(2 - 3)^2 + ((-3) - 0)^2] = sqrt[1 + 9] = sqrt[10]
And the distance from (3, 0) to (5, 6) is:
sqrt[(5 - 3)^2 + (6 - 0)^2] = sqrt[4 + 36] = sqrt[40]
So, the ratio in which the x-axis divides the line segment is sqrt[10] : sqrt[40], or simplifying, 1:2.
Solution 2
To find the ratio in which the line segment joining the points (2,-3) and (5,6) is divided by the x-axis, we need to find the point where the line segment intersects the x-axis.
The x-axis is defined by y = 0.
We can find the equation of the line segment using the formula for a line in slope-intercept form, y = mx + b, where m is the slope and b is the y-intercept.
First, we find the slope (m) of the line segment using the formula m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are the coordinates of the two points.
Substituting the given points, we get m = (6 - (-3)) / (5 - 2) = 9 / 3 = 3.
Next, we find the y-intercept (b) by substitifying one of the points and the slope into the equation y = mx + b. Using the point (2,-3), we get -3 = 3*2 + b, which simplifies to b = -3 - 6 = -9.
So, the equation of the line segment is y = 3x - 9.
Setting y = 0 (since we're looking for where the line intersects the x-axis), we get 0 = 3x - 9. Solving for x, we get x = 9 / 3 = 3.
So, the line segment intersects the x-axis at the point (3,0).
Finally, we find the ratio in which this point divides the line segment. This is done by finding the distances from the point of intersection to the two given points, and then forming a ratio from these distances.
The distance from (2,-3) to (3,0) is sqrt((3-2)^2 + (0-(-3))^2) = sqrt(1 + 9) = sqrt(10).
The distance from (5,6) to (3,0) is sqrt((3-5)^2 + (0-6)^2) = sqrt(4 + 36) = sqrt(40).
So, the ratio in which the x-axis divides the line segment is sqrt(10) : sqrt(40), or simplifying, 1:2.
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