Q. Line ℓ has equation y=x−3. Find the distance between ℓ and the point E(−1,3).Round your answer to the nearest tenth
Write Equation and Coordinates: Write down the equation of line ℓ and the coordinates of point E.Line ℓ: y=x−3Point E: (−1,3)
Determine Line Slope: Determine the slope of line ℓ. The slope of line ℓ is the coefficient of x in the equation y=x−3, which is 1.
Find Perpendicular Slope: Find the slope of the line perpendicular to line ℓ. The slope of a line perpendicular to another line is the negative reciprocal of the original line's slope. Since the slope of line ℓ is 1, the slope of the perpendicular line is −1.
Write Perpendicular Line Equation: Write the equation of the line perpendicular to line ℓ that passes through point E(−1,3).Using the point-slope form of a line's equation, y−y1=m(x−x1), where m is the slope and (x1,y1) is a point on the line, we get:y−3=−1(x−(−1))y−3=−1(x+1)
Simplify Perpendicular Line: Simplify the equation of the perpendicular line. y−3=−x−1y=−x+2This is the equation of the line perpendicular to line ℓ that passes through point E.
Find Point of Intersection: Find the point of intersection between line ℓ and the perpendicular line.To find the intersection, set the equations of line ℓ and the perpendicular line equal to each other:x−3=−x+22x=5x=25Now, substitute x back into the equation of line ℓ to find y:y=(25)−3y=25−26ℓ0The point of intersection is ℓ1.
Calculate Distance: Calculate the distance between point E and the point of intersection.Use the distance formula: d=((x2−x1)2+(y2−y1)2), where (x1,y1) is point E and (x2,y2) is the point of intersection.d=((5/2−(−1))2+(−1/2−3)2)d=((5/2+1)2+(−1/2−3)2)d=((5/2+2/2)2+(−1/2−6/2)2)d=((7/2)2+(−7/2)2)d=(49/4)+(49/4)d=(98/4)d=(49/2)(x1,y1)0(x1,y1)1Round to the nearest tenth: (x1,y1)2
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