Chapter 1 - Foundations for Algebra - 1-1 Variables and Expressions - Practice and Problem-Solving Exercises - Page 8: 29

$\frac{3}{7}$y-4

We are told that the expression is "four less than 3/7 of y." Because it is 3/7 of y, we know we must multiply y by 3/7. We then subtract 4 since we are told that are answer should be "4 less than" $\frac{3}{7}$y.