Given the function below, find the equation of the tangent line at the given value. Write your equation in STANDARD FORM $(Ax+By=C$ where $A$ is positive and $A,B,C$ are Integers$)$ If the value of $A,B,$ or $C$ is $1$ or $-1,$ write $1$ or $-1.$

$y=x-\sqrt[\phantom{2}]{x}$ at $x=4$

What is the point that the graph and the tangent line both contain? $($

$$

$$

What is the slope of the tangent line AS A FRACTION $\frac{a}{b}$

$$

TANGENT $x+y=$

$$

What is the slope of the normal line at that point AS A FRACTION $\frac{a}{b}$