The slope of y=2x+1 is: 2. The parallel line needs to have the same slope of 2. We can solve it using the point-slope equation of a line: y â y1 = 2(x â x1) And then put in the point (5,4): y â 4 = 2(x â 5) And that answer is OK, but let's also put it in y = mx + b form: y â 4 = 2x â 10.
1 In-office teeth whitening treatments by a dentist can cost $300-$1,000 or more, but average about $500-$700.
A custom tray that you can use at home usually costs $400 or less. Cost of whitening at dentistâs office. The average cost of in-office teeth whitening is $650, although it can climb to $1,000 or more, depending on the type of product used and how much your dentist charges. In many cases, in-office teeth whitening pays off.