# What does the problem mean?

• Dec 1st 2012, 02:32 AM
rcs
What does the problem mean?
The points (– 2, 1) and (–5, 4) are reflected with respect to the
y – axis. What is the area of the figure formed by the two points
and their reflections?
• Dec 1st 2012, 02:37 AM
MarkFL
Re: What does the problem mean?
A point $(x,y)$ reflected across the $y$-axis becomes $(-x,y)$.
• Dec 1st 2012, 07:36 AM
Soroban
Re: What does the problem mean?
Hello, rcs!

Quote:

The points P(–2, 1) and Q(–5, 4) are reflected with respect to the y–axis.
What is the area of the figure formed by the two points and their reflections?

Think of the y-axis as a mirror.

Code:

                |                 |     (-2,1)    |    (2,1)       P* - - - + - - - *P'         :      |      :       --+---+---+---+---+--       -2  -1  |  1  2                 |
$\text{The "image" of }P(\text{-}2,1)\,\text{ is }\,P'(2,1).$