A line segment has endpoints at (1 ,2 )(1,2) and (2 , 2 )(2,2). If the line segment is rotated about the origin by (3 pi ) /2 3π2, translated vertically by -3 3, and reflected about the y-axis, what will the line segment's new endpoints be?

1 Answer
Jul 27, 2018

(-2,-4)" and "(-2,-5)(2,4) and (2,5)

Explanation:

"Since there are 3 transformations to be performed label"since there are 3 transformations to be performed label
"the endpoints"the endpoints

A=(1,2)" and "B=(2,2)A=(1,2) and B=(2,2)

color(blue)"first transformation"first transformation

"under a rotation about the origin of "(3pi)/2under a rotation about the origin of 3π2

• " a point "(x,y)to(y,-x) a point (x,y)(y,x)

A(1,2)toA'(2,-1)

B(2,2)toB'(2,-2)

color(blue)"second transformation"

"under a vertical translation "((0),(-3))

• " a point "(x,y)to(x,y-3)

A'(2,-1)toA''(2,-4)

B'(2,-2)toB''(2,-5)

color(blue)"third transformation"

"under a reflection in the y-axis"

• " a point "(x,y)to(-x,y)

A''(2,-4)toA'''(-2,-4)

B''(2,-5)toB'''(-2,-5)

"After all 3 transformations"

(1,2)to(-2,-4)" and "(2,2)to(-2,-5)