Question

what is the domain of the function y=-5x+8

Answer 1

Start with all Real numbers.

Can you exclude any numbers at all? If not, the domain is all real numbers.

Answer 2

this function is in the form of a linear function meaning that its
y=mx+b and as long as its in that form then the domain *meaning the x values* will be all real x values

Answer 3

Since there are no numbers that cause the equation to be undefined, all numbers are allowed as replacements for x and so the domain is all real numbers.