Because when we draw a point ,we draw a very very small line....one can see how this might lead to a problem.consider a line that is 1 inch long,what we want to looked at 1/1000 through that line it would still be a line.but,if we drew it ,it would look like a point....
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Step-by-step explanation:
dont have a creative way but i just remember rise over run or 
hope this helps <3
10 or u could do 25 divided by 2.5 is 10