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Fantom [35]
3 years ago
7

Point C is located at (1, 2) and point D is located at (−4, −2). Find the x value for the point that is 1\4 the distance from po

int C to point D
Mathematics
1 answer:
max2010maxim [7]3 years ago
7 0

The easiest way to do this is to realize this is a <em>weighted average</em> of the two points.  (A weighted average is a linear combination where the coefficients add to one.)


(x,y) = (1-t)C + tD


where t is a real parameter. When t=0 we're at point C, when t=1 we're at point D. We're interested in t=1/4,


(x,y)= (3/4) C + (1/4) D


We're only asked for the x coordinate:


x = (3/4) (1) + (1/4) (-4) = 3/4 - 1 = - 1/4


Answer: \quad - \dfrac 1 4



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If you write equations for the charges, they will look like ...

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