What is the perimeter of △LMN? 8 units
9 units
6 + StartRoot 10 EndRoot units
8 + StartRoot 10 EndRoot units

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.