Step 
<u>Find the slope of the line</u>
we know that
the formula to calculate the slope between two points is equal to
Let
substitute the values
Step 
with the slope m and the point 
find the equation of the line
we know that
the equation of the line in the point-slope form is equal to
substitute the values
therefore
<u>the answer is</u>
Let's pick one person at random and call it the 'first'.
That person shakes hands with 29 other classmates.
Take another person different from the first, we'll call him the 'second'. Since he has already shaken hands with the first, he shakes hands with 28 other classmates.
The 'third' person will likewise shake hands with 27 other classmates, and so on.
Hence, the total number of handshakes is 29+28+27+...+2+1 = 29*30/2=435 handshakes
i hope this helps you....
How many coins do they have in all?
Paige is ahead of kate. It dosen't say she is behind anyone or last in the line. Carlos is not first in line. Kate cannot be first because someone is ahead of her. And lisa is last. So the answer is definitely paige. Hope i helped. Have a nice day.
