Distribute 2/5 and 3/5 into the ():
2/5(a+b)+3/5(a+c)
2/5 a+ 2/5 b+3/5 a+ 3/5 c
combine the like terms:
2/5 a+3/5 a= 5/5 a --> 1a --> a
new simplified equation:
a+2/5 b+3/5 c
Hey there!
40 - 23 = 17
x = 17
Hope this helps
Have a great day (:
the constant of variation or namely its slope will be

You are right. Transitivity means, that:
if a = b and b = c, then a = c
(here a = x, b=5 and c = y).