Answer:
A. One line
Step-by-step explanation:
Let rearrange the system of equations into explicit forms:




The second equation is identical to the first one, which means that there is just one line.
The slope of the line that passes through the points (-15,7) and (14,7) is 0
Do you have a picture where I can understand it much better?
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Answer:
The unit rate is 15 feet per second.