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.
The gel stays on for 15 or 20 minutes. That process is repeated once or twice. Sometimes the dentist aims a light at your teeth to speed up the whitening (although most studies show the lights donât do much). This whole treatment costs around $500 or $600, but many dentists offer discounts to attract new patients.