Points A and B are at $(4 ,9 )$ and $(6 ,8 )$ , respectively. Point A is rotated counterclockwise about the origin by $(3pi)/2$ and dilated about point C by a factor of $2$ . If point A is now at point B, what are the coordinates of point C?

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Points A and B are at $(4 ,9 )$ and $(6 ,8 )$ , respectively. Point A is rotated counterclockwise about the origin by $(3pi)/2$ and dilated about point C by a factor of $2$ . If point A is now at point B, what are the coordinates of point C?

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Answer 1 · 2018-04-20T12:46:16

$C=(12,-16)$

Explanation:

$"under a counterclockwise rotation about the origin of "(3pi)/2$

$• " a point "(x,y)to(y,-x)$

$rArrA(4,9)toA'(9,-4)" where A' is the image of A"$

$rArrvec(CB)=color(red)(2)vec(CA')$

$rArrulb-ulc=2(ula'-ulc)$

$rArrulb-ulc=2ula'-2ulc$

$rArrulc=2ula'-ulb$

$color(white)(rArrulc)=2((9),(-4))-((6),(8))$

$color(white)(rArrulc)=((18),(-8))-((6),(8))=((12),(-16))$

$rArrC=(12,-16)$

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Points A and B are at $(4 ,9 )$ and $(6 ,8 )$ , respectively. Point A is rotated counterclockwise about the origin by $(3pi)/2$ and dilated about point C by a factor of $2$ . If point A is now at point B, what are the coordinates of point C?

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Explanation:

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Points A and B are at (4 ,9 )(4 ,9 ) and (6 ,8 )(6 ,8 ), respectively. Point A is rotated counterclockwise about the origin by (3pi)/2 (3pi)/2 and dilated about point C by a factor of 2 2 . If point A is now at point B, what are the coordinates of point C?

1 Answer

Explanation:

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Points A and B are at $(4 ,9 )$ and $(6 ,8 )$ , respectively. Point A is rotated counterclockwise about the origin by $(3pi)/2$ and dilated about point C by a factor of $2$ . If point A is now at point B, what are the coordinates of point C?