How would your graph look different if you started with 10bacteria instead of 1?

The graph would look different, because the starting point would be different. Since here you started at 0, because there were 0 bacteria in the beginning, it would instead start higher up. The slope would also be greater, since you're starting with 10 * 2, and then continuing to multiply from there, instead of with powers of 2.

The correct graph is the second one, with the points being at (-6,0), (2,0) and reaching down to (-2,-8)