Points A and B are at $(4 ,1 )$ and $(3 ,7 )$ , respectively. Point A is rotated counterclockwise about the origin by $pi$ and dilated about point C by a factor of $3$ . 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 $(4 ,1 )$ and $(3 ,7 )$ , respectively. Point A is rotated counterclockwise about the origin by $pi$ and dilated about point C by a factor of $3$ . If point A is now at point B, what are the coordinates of point C?

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Answer 1 · 2018-05-03T13:17:04

$C=(-15/2,-5)$

Explanation:

$"under a counterclockwise rotation about the origin of "pi$

$• " a point "(x,y)to(-x,-y)$

$rArrA(4,1)toA'(-4,-1)" where A' is the image of A"$

$rArrvec(CB)=color(red)(3)vec(CA')$

$rArrulb-ulc=3(ula'-ulc)$

$rArrulb-ulc=3ula'-3ulc$

$rArr2ulc=3ula'-ulb$

$color(white)(rArr2ulc)=3((-4),(-1))-((3),(7))$

$color(white)(rArr2ulc)=((-12),(-3))-((3),(7))=((-15),(-10))$

$rArrulc=1/2((-15),(-10))=((-15/2),(-5))$

$rArrC=(-15/2,-5)$

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Points A and B are at $(4 ,1 )$ and $(3 ,7 )$ , respectively. Point A is rotated counterclockwise about the origin by $pi$ and dilated about point C by a factor of $3$ . If point A is now at point B, what are the coordinates of point C?

1 Answer

Explanation:

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Science

Math

Humanities

... and beyond

Points A and B are at (4 ,1 )(4 ,1 ) and (3 ,7 )(3 ,7 ), respectively. Point A is rotated counterclockwise about the origin by pi pi and dilated about point C by a factor of 3 3 . 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 $(4 ,1 )$ and $(3 ,7 )$ , respectively. Point A is rotated counterclockwise about the origin by $pi$ and dilated about point C by a factor of $3$ . If point A is now at point B, what are the coordinates of point C?