To write: an equation of the line containing the median that joins the first vertex to the side opposite to it.
y=43x−203
Given information:
The ordered pairs given below represent the vertices of a
(8,4),(0,0),(10,0)
Formula Used:
The Midpoint Formula
The midpoint formula shown below, gives the midpoint of the line segment joining the points A(x1,y1) and B(x2,y2) .
M(x1+x22,y1+y22)
Slope of the line segment
The slope of the line segment joining the points A(x1,y1) and B(x2,y2) is:
m=y2−y1x2−x1
Equation of the line
The equation of a line passing through (x0,y0) and having the slope m is:
y−y0=m(x−x0)
Explanation:
A median of a triangle is a line segment joining a vertex and the midpoint of the opposite side.
So, first step is to find the midpoint between the two opposite vertices (0,0) and (10,0) .
By the midpoint formula,
M=(x1+x22,y1+y22)=(0+102,0+02)=(102,0)=(5,0)
Next step is to find the slope that goes through the above midpoint and the first vertex (8,4) .
m=y2−y1x2−x1=4−08−5=43
Then, the equation of the line that passes through the midpoint (5,0) and has the slope 43 is:
y−y0=m(x−x0)y−0=43(x−5)y=43x−203
Chapter 8 Solutions
Holt Mcdougal Larson Algebra 2: Student Edition 2012
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