The expression to determine her take-home pay after expenses is p = 135.50x - 650
Solution:
Given that Sally designs webpages for customers
She charges $135.50 per web page
Let "x" be the number of webpages she designed per month
Let "p" be the money she takes home after expenses
One webpage cost = $ 135.50
Then for "x" webpages she designs, cost = 135.50x
She must pay a monthly rental fee of $650 for her office
The expression to determine her take-home pay after expenses is given as:
pay after expenses = money earned from designing "x" webpages - monthly rental fee
p = 135.50x - 650
Thus the expression is found out