This is what the graph looks like hope this helps:)
Slope would be undefined because there are many many y-values for one x value. This is impossible for ANY function. To be specific, the correct equation that names the graph is <em>x=4</em>. Please note that this is <u>not</u> a function. If it goes straight up, it is <u>UNDEFINED</u>!!!
Hope I helped!
The answer is <u><em>D</em></u>
So one trip = 4 km
two trips = 8
8 + 4 = 12
i believe your answer is 12
Thanks!