Part $1$: $!!($ONLY NEED HELP QUESTION $4$ and $5!!)$

A group of students from CSUN started a taco truck business called Matador Tacos. They need to figure out the price that they want to charge for each taco.

After some research on some nearby taco truck businesses, the students were able to determine that the price$-$demand equation for their tacos is $0\mathrm{.}1x+5p=40$ where $x$ is the demand $($in number of tacos$)$ and $p$ is the price $($in dollars$)$ for each taco.

$!!$ONLY NEED HELP QUESTIONS $4$ AND $5!!$

Interpret the intercepts of the price$-$demand equation $($where demand is a function of price$)$ in the context of the problem.

Find and interpret the slope of the price$-$demand equation $($where demand is a function of price$)$ in the context of the problem.

Does it make sense to sell $800$ tacos? Explain why or why not.