Question

What are the coordinates of the image of -3, 2 when the point is reflected across the line ? y=4
please just give me the answer

Answer 1

Thank you!!!!!!!

Answer 2

yw

Answer 3

Wait that's not one of the answers

Answer 4

A -1,6
b -3,6
c -3,4
b 6,-3

Answer 5

@surjithayer

Answer 6

i see b

Answer 7

thanks

Answer 8

could you help me with something else?

Answer 9

@surjithayer

Answer 10

i will try.

Answer 11

Translate the triangle with A (3, 4) B (2, -1) and C (4, 12) along the vector (-1, 3) Find the coordinates of the new image.

Answer 12

@surjithayer

Answer 13

@surjithayer

Answer 14

do you know the answer? :)

Answer 15

Slope of line PQ=3/-1=-3

Slope of any line perpendicular to line PQ=-1/-3=1/3
eq. of line PQ is y-3=-3(x+1) or y=-3x ...(1)
eq. of any line perpendicular to PQ through (4,12) is
y-12=1/3 (x-4)
3y-36=x-4
or 3y-x=36-4=32 ...(2)
because it cuts line (1)
3(-3x)-x=32
-9x-x=32
x=-3.2
y=-3x=-3*-3.2=9.6
point of intersection is (-3.2,9.6)
let (x1,y1) be the image of C.
then \[\frac{ x1+4 }{ 2 }=-3.2,x1=-3.2*2-4=-6.4-4=-10.4\]
\[\frac{ y1+12 }{ 2 }=9.6,y1=2*9.6-12=19.2-12=7.2\]
therefore C' is (-10.4,7.2)
similarly try for A' and B'