When is the difference of two decimals an integer?

I'm adding on to the other person's answer (I know this is really late since this is four years ago, but I'm doing it for the points). The difference of two decimals can also be an integer when they both have different signs and the decimal parts add up to 1.

answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.