In 2015, the population of the United States was about 320 million people. Females make up about 51% of the total population of the United States. About how many males live here? 163 million 145 million 157 million 173 million hi I need help fast please​

Look at x = 4. Note how we can draw a vertical line through 4 on the x axis and this single vertical line crosses more than one point. This means the graph fails the vertical line test, and therefore it is not a function.

A single input (x = 4) leads to more than one output (y = -2 and y = 4 at the same time). A function is only possible if any given input in the domain leads to exactly one output.