Question 108271
Kevin works 3 times as many hours in a week as Karen does. If each were to work 6 h more per week, Kevin would be working twice as many hours as Karen does. How many hours does each work  now?

Kevin works x hours
karen works y hours

x=3y
x+6=2(y+6)


x-3y=0
x+6=2y+12
x-2y=6
*[invoke linear_substitution "x", "y", 1, -3, 0, 1, -2, 6]