Which equation represents a line which is parallel to x = 0? 1. X=1/5y
2. Y=x
3. Y=-7
4. X=-8

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?