Which of the relations is not a function?

Is the above relation a function?

Decide if the following statement about functions is true or false:All relations are functions.

Which of the following relations is not a function?*R = {(1,2), (1,4), (3,1), (5,1)}R = {(1,2), (3,4), (2,1), (5,2)}R = {(2,1), (4,4), (3,1), (5,1)}R = {(1,2), (3,4), (2,1), (5,1)}

We can determine whether a relation is a function by looking at itsgraph.→ No ______ points on the graph can have the same __-coordinate(lie on the same __________________ line).→ If a __________________ line drawn on the graph of any functiontouches two points, then the graph does not representa function. (called the ____________________ line test)❖ The only type of straight line that graph fails the vertical line test is a __________________ line.

A ________________ line is defined by theequation x = a, where a is any real number.A relation represented by x = a:is a function.is not a function.If we graph y = a, the graph will be a _________________line.A relation represented by y = a:is a function.is not a function.Which of these relations are functions?𝑦 = 5𝑦 = 2𝑥 − 5𝑥 = −22𝑦 = 𝑥 − 4