Question 921922
Build the equation logically according to the values given.


I must assume 1 fourpack of socks sells for $10.99.


Marie's cost, if buying y fourpacks of socks and the 1 vest:
{{{38.79+(10.99)*y}}}, dollars for the cost.


Marie spent exact-change for the cost.
{{{highlight_green(38.79+(10.99)y=60.77)}}}
You want to solve this equation for y; but more important is to first understand how this equation was created, which has been done here.