A line segment has endpoints at (0 ,0 )(0,0) and (1 , 3 )(1,3). If the line segment is rotated about the origin by pi /2 π2, translated horizontally by 5 5, and reflected about the y-axis, what will the line segment's new endpoints be?

1 Answer
Jan 22, 2018

(-5,0)" and "(-2,1)(5,0) and (2,1)

Explanation:

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

A(0,0)" and "B(1,3)A(0,0) and B(1,3)

color(blue)"first transformation"first transformation

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

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

rArrA(0,0)toA'(0,0)

rArrB(1,3)toB'(-3,1)

color(blue)"second transformation"

"under a translation "((5),(0))

• " a point "(x,y)to(x+5,y)

rArrA'(0,0)toA''(5,0)

rArrB'(-3,1)toB''(2,1)

color(blue)"third transformation"

"under a reflection in the y-axis"

• " a point "(x,y)to(-x,y)

rArrA''(5,0)toA'''(-5,0)

rArrB''(2,1)toB'''(-2,1)

"after all 3 transformations"

(0,0)to(-5,0)" and "(1,3)to(-2,1)