Answer
The input is written incorrectly for graphing calculator.
Work Step by Step
Graphing calculator (And calculators in general) are very sensitive to the input. It follows some steps.
For example, $(...)$ the brackets are calculated first. then goes power, followed by multiplication and division and then addition and subtraction.
In this example the first input is calculated as follows:
$y_1=\frac{x^1}{3}$
$y_2=\frac{x}{x}+4$
The calculator visualizes the input as a linear equation, so it graphs two lines.
