I don't understand this

Question: a) does the given set of points represent a linear function? how do you know? b) assume that the point (-2,4) lies on the graph of a line. what y-values could complete this set of ordered pairs that lie on the same line: (- (hint: there are several correct answ

Find the domain of the following expression: 1/(√x)-2

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?