Question 339772
She earns x each weekday.
She earns 2*x each weekend day
She earns 5*x + 2*(2*x) for the whole week.
That's equivalent to 9*x for the whole week.


There are 5 weekdays and each earns x for a total of 5*x.


There are 2 weekend days and each earns 2*x for a total of 2*2*x = 4*x.


5*x + 4*x = 9*x.