The shortest distance from point K to line is the length of a segment perpendicular to from point K. Draw a perpendicular segment from K to.
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1 8. Find the distance between each pair of parallel lines with the given equations. Copy each figure. Construct the segment that represents the distance indicated. 12. K to The shortest distance from point K to line is the length of a segment perpendicular to from point K. Draw a perpendicular segment from K to. The two lines have the coefficient of x, zero. So, the slopes are zero. Therefore, the lines are horizontal lines passing through y = 7 and y = 3 respectively. The line perpendicular will be vertical. Thus, the distance, is the difference in the y-intercepts of the two lines. Then perpendicular distance between the two horizontal lines is 7 ( 3) = 10 units. 10 units esolutions Manual - Powered by Cognero Page 1
2 14. APPLY MATH Rondell is crossing the courtyard in front of his school. Three possible paths are shown in the diagram. Which of the three paths shown is the shortest? Explain your reasoning. COORDINATE GEOMETRY Find the distance from P to 17. Line contains points ( 2, 1) and (4, 1). Point P has coordinates (5, 7). Use the slope formula to find the slope of the line.let (x 1 ) = ( 2, 1)and (x 2, y 2 ) = (4, 1). The shortest possible distance would be the perpendicular distance from one side of the courtyard to the other. Since Path B is the closest to 90, it is the shortest of the three paths shown. Path B; The shortest possible distance would be the perpendicular distance from one side of the courtyard to the other. Since Path B is the closest to 90, it is the shortest of the three paths shown. Use the slope and any one of the points to write the equation of the line. Let (x 1 ) = ( 2, 1). The slope of an equation perpendicular to will be undefined, and hence the line will be a vertical line. The equation of a vertical line through (5, 7) is x = 5. The point of intersection of the two lines is (5, 1). between the points (5, 1) and (5, 7). Let (x 1 ) = (5, 1) and (x 2, y 2 ) = (5, 7). Therefore, the distance between the line and the point is 6 units. 6 units esolutions Manual - Powered by Cognero Page 2
3 Find the distance between each pair of parallel lines with the given equations The two lines are horizontal lines and for each equation, the coefficient of x-term is zero. So, the slopes are zero. Therefore, the line perpendicular to the parallel lines will be vertical. The distance of the vertical line between the parallel lines, will be the difference in the y-intercepts. To find the perpendicular distance between the two horizontal lines subtract 2 from 4 to get 4 ( 2) = 6 units. 6 units 23. The two lines are vertical and of the form x = a. So, the slopes are undefined. Therefore, the lines are vertical lines passing through x = 3 and x = 7 respectively. The line perpendicular to each line will be horizontal. The distance will be the difference in the x-intercepts. To find the perpendicular distance between the two horizontal lines subtract 3 from 7 to get 7 3 = 4 units 4 units To find the distance between the parallel lines, we need to find the length of the perpendicular segment between the two parallel lines. Pick a point on one of the equation, and write the equation of a line perpendicular through that point. Then use this perpendicular line and other equation to find the point of intersection. Find the distance between the two point using the distance formula. Step 1: Find the equation of the line perpendicular to each of the lines. The slope of a line perpendicular to both the lines will be Consider the y-intercept of any of the two lines and write the equation of the perpendicular line through it. The y-intercept of the line y = 5x + 4 is (0, esolutions Manual - Powered by Cognero Page 3
4 4). So, the equation of a line with slope and a y- intercept of 4 is 24. Step 2: Find the intersections of the perpendicular line and each of the other lines. To find the point of intersection of the perpendicular and the second line, solve the two equations. The left sides of the equations are the same. So, equate the right sides and solve for x. To find the distance between the parallel lines, we need to find the length of the perpendicular segment between the two parallel lines. Pick a point on one of the equation, and write the equation of a line perpendicular through that point. Then use this perpendicular line and other equation to find the point of intersection. Find the distance between the two point using the distance formula. Step 1: Find the equation of the line perpendicular to each of the lines. Use the value of x to find the value of y. So, the point of intersection is (5, 3). Step 3: Find the length of the perpendicular between points between the points (5, 3) and (0, 4). Let (x 1 ) = (5, 3) and (x 2, y 2 ) = (0, 4). The slope of a line perpendicular to both the lines will be 3. Consider the y-intercept of any of the two lines and write the equation of the perpendicular line through it. The y-intercept of the line is (0, 2). So, the equation of a line with slope 3 and a y-intercept of 2 is Step 2: Find the intersections of the perpendicular line and each of the other lines. To find the point of intersection of the perpendicular and the second line, solve the two equations. The left sides of the equations are the same. So, equate the right sides and solve for x. Therefore, the distance between the two lines is Use the value of x to find the value of y. esolutions Manual - Powered by Cognero Page 4
5 So, the point of intersection is Step 3: Find the length of the perpendicular between points. between the points and (0, 2). Let (x 1, y 1 ) = and (x 2, y 2 ) = (0, 2). Therefore, the distance between the two lines is esolutions Manual - Powered by Cognero Page 5
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