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\documentclass[a4paper, 12pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\DeclareUnicodeCharacter{202F}{\,}
\begin{document}
\title{Solutions to Math Exercises}
\author{Yao Zhao \\ University of Wisconsin-Madison}
\maketitle
1.a. slope = $-\frac{2}{5}$ \\
1.b. slope = undefined (infinity) \\
Many thanks in advance!