Answer :
a) 4x, there are 4 x’s, so just add them together
b) 4k || -3k + 1k = -2k, 6k - 2k = 4k OR
6k + 1k = 7k, 7k - 3k = 4k
b) 4k || -3k + 1k = -2k, 6k - 2k = 4k OR
6k + 1k = 7k, 7k - 3k = 4k