The vertices of Upper Delta ABC
are Upper A (-5,4)
​,
Upper B (-2,3)
​,
and Upper C (-2,2)
.
If Upper Delta
ABC
is reflected across the line y equals 1
to produce the image Upper Delta
​A'B'C',
find the coordinates of the vertex Upper B
​'.
The coordinates of Upper B
​'
after a reflection across the line y equals 1

are
.

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