Ryan and Karl spent 28 hours building a tree house. Ryan worked 4 more hours than Karl. How many hours did each work?

Question

show all work and determine if substitution or elimination.

Answer 1

x+(x+4)=28

2x+4=28

2x=24

x=12

y=16

Answer 2

k represents the hours Kyle worked

k + 4 represents the hours Ryan worked

k + k + 4 = 28

Can you solve for k and answer?