What is the Vertex of the graph?

options:
(1,1)
(-1,1)
(0,1)
(1,0)

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

answer: #1 ads up by 8 and i don't know #2