Update main.tex

Author: annadavismath

LTR-0070/main.tex

@@ -28,7 +28,7 @@ \subsection*{Horizontal and Vertical Scaling}
 
 \begin{exploration}\label{init:vertstretch} Let us attempt to find a matrix $M$ for the transformation $T$ that stretches an image vertically by a factor of 2, as shown in the figure below.  
 
-\begin{center}
+\begin{image}
 		\begin{tikzpicture}[scale=2]
 \node[inner sep=0pt, anchor=base] (gulls) at (6.25mm,0)
   {\includegraphics[width=25mm]{gulls.jpg}};
@@ -42,7 +42,7 @@ \subsection*{Horizontal and Vertical Scaling}
 \draw[<->] (-0.5,0)--(2,0);
   \draw[<->] (0,-0.5)--(0,2);
     \end{tikzpicture}
-    \end{center}
+    \end{image}
 
 Consider what this transformation does to the standard unit vectors.  We observe that $T(\vec{i})=\vec{i}$ and $T(\vec{j})=2\vec{j}$.