Temperatures measured in degrees Fahrenheit (F) are related to temperatures measured in degrees Celsius (C) by the formula F = 9C/5 + 32. There is 1 value of x for which x degrees Fahrenheit equals x degrees Celsius. What is that value?
The correct answer is B.
For the temperature we are looking for, F = C = x.
Substituting x for both C and F into the given formula, we get
x = 9x/5 + 32
Multiplying both sides of this equation by 5, combining like terms, and solving for x, we get
5x = 9x + 160
4x = -160
x = -40