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?
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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?
A point $\displaystyle (x,y)$ reflected across the $\displaystyle y$axis becomes $\displaystyle (x,y)$.
Hello, rcs!
Quote:
The points P(2, 1) and Q(5, 4) are reflected with respect to the yaxis.
What is the area of the figure formed by the two points and their reflections?
Think of the yaxis as a mirror.
$\displaystyle \text{The "image" of }P(\text{}2,1)\,\text{ is }\,P'(2,1).$Code:

(2,1)  (2,1)
P*    +    *P'
:  :
+++++
2 1  1 2
