A student attempted to solve the system $\displaystyle{5}{x}+{2}{y}={10}\usepackage{cmbright}\Huge\$ and $\displaystyle-{10}{x}+{2}{y}={1}\usepackage{cmbright}\Huge\$ by graphing. The graph and the conclusion are below. What can you say about the student's work?

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The soluion is $\displaystyle{\left(\frac{{1}}{{2}},\frac{{7}}{{2}}\right)}\usepackage{cmbright}\Huge\$ .