00:01
So first i want to determine if this graph is a function.
00:03
What is the definition of a function? well, for each y, there's exactly one x.
00:08
And the way to test this is the vertical line test.
00:10
So if i were to draw a vertical line anywhere in my graph, i would only cross the graph at one point.
00:17
So this is satisfied forever throughout the graph, so it is definitely a function.
00:22
What about my domain in range? well, domain is all my x values.
00:27
And notice my x -axis goes left to right.
00:29
So what's my leftmost point? well, my leftmost point is approximately, if i had to look at my leftmost point, closed circle, it happens at negative 3, and i hit all the points in between negative 3, all the way until my rightmost point...