For the straight line defined by the points 1 53 and 3 91 de
     For the straight line defined by the points (1, 53) and (3, 91), determine the slope and y-intercept. Do not round the answers. 
  
  Solution
slope of line joining (a,b),(c,d) is m =(d -b)/(c-a)
slope of line joining (1,53),(3,91) is m =(91 -53)/(3-1)=38/2 =19
general equation of line in slope intercept form is y =mx+b, where b is y intercept
here our equation is y =19x +b
y =19x +b passes through (1,53)
53 =19(1) +b
b=53-19
b=34
slope m =19, y intercept =34

