31. (a) æ = x1+ (x2 – ¤1)t, y = y1 + (y2 – y1)t, 0

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Chapter2: Second-order Linear Odes
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31. (a) æ = x1+ (x2 – æ1)t, y = y1 + (y2 – y1)t, 0 < t<1. Clearly the curve passes through P:(x1,y1) when t = 0 and
through P2 (x2, y2) when t = 1. For 0 <t < 1, æ is strictly between æi and æ2 and y is strictly between y1 and y2. For
Y2 – Y1
every value of t, æ and y satisfy the relation y – yı =
(æ – æ1), which is the equation of the line through
x2 - x1
P: (x1, Y1) and P(x2, Y2).
y - y1
Finally, any point (x, y) on that line satisfies
if we call that common value t, then the given
42 - Y1
x2 - ¤1
parametric equations yield the point (æ, y); and any (æ, y) on the line between P1(x1, y1) and P2(x2, y2) yields a value of
t in [0, 1]. So the given parametric equations exactly specify the line segment from P1 (x1, yı) to P2(x2, y2).
(b) æ = -2+ [3 –-(-2)]t = -2+5t and y = 7 + (–1 – 7)t = 7 – 8t for 0 <t< 1.
Transcribed Image Text:31. (a) æ = x1+ (x2 – æ1)t, y = y1 + (y2 – y1)t, 0 < t<1. Clearly the curve passes through P:(x1,y1) when t = 0 and through P2 (x2, y2) when t = 1. For 0 <t < 1, æ is strictly between æi and æ2 and y is strictly between y1 and y2. For Y2 – Y1 every value of t, æ and y satisfy the relation y – yı = (æ – æ1), which is the equation of the line through x2 - x1 P: (x1, Y1) and P(x2, Y2). y - y1 Finally, any point (x, y) on that line satisfies if we call that common value t, then the given 42 - Y1 x2 - ¤1 parametric equations yield the point (æ, y); and any (æ, y) on the line between P1(x1, y1) and P2(x2, y2) yields a value of t in [0, 1]. So the given parametric equations exactly specify the line segment from P1 (x1, yı) to P2(x2, y2). (b) æ = -2+ [3 –-(-2)]t = -2+5t and y = 7 + (–1 – 7)t = 7 – 8t for 0 <t< 1.
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