math
posted by syram on .
Identify the property or rule that justifies each step in the calculation.
4/7k+(j+1/7k) ________
(4/7k+1/7k)+j ________
k(4/7+1/7)+j _________
(4/7k+1/7k)+j ________
5/7k+j _______
Hint: you cannot say that 5/7k+j is the answer

from the first step to the second
You used the Commutative Law and the Associative law.
from the second step to the first step you factored out the common K.
It looks like it was put back in for the next step.
Last step.. combined like terms.