Skip to main content\( \newcommand{\N}{\mathbb N}
\newcommand{\Z}{\mathbb Z}
\newcommand{\Q}{\mathbb Q}
\newcommand{\R}{\mathbb R}
\usepackage{xcolor,color}
\newcommand{\aroc}{\text{ARC}}
\newcommand{\pbr}[1]{\left( #1 \right)}
\newcommand{\sbr}[1]{\left\{ #1 \right\}}
\newcommand{\cbr}[1]{\left[ #1 \right]}
\newcommand{\abs}[1]{\left\lvert #1 \right\rvert}
\newcommand{\markcell}[2]{
\tikz[remember picture, baseline=(#1.base)] \node[inner sep=0pt] (#1) {#2};
}
\newcommand{\lt}{<}
\newcommand{\gt}{>}
\newcommand{\amp}{&}
\definecolor{fillinmathshade}{gray}{0.9}
\newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}}
\)
Instructions.
Drag the point
\(x\) to see how
\((x,y)\) changes.