Question 53660
slope= (b - a)/(a - b)= - 1, les asume that b=4 and a=7, then (4 - 7)/(7 - 4) = 
- 3/3= -1



slope = (b -(-a))/ (a -(-b)) (b + a )/( a + b) = 1

les asume that b=4 and a=7,
(4 + 7)/(7 + 4) = 1