The day-time temperature in Sutherland was recorded as 9 degrees Celsius. During the night the temperature dropped by 16 degrees Celsius. Express an equation?

9 - 16 = ?

To express the change in temperature from daytime to nighttime in Sutherland, we can use the equation:

Nighttime temperature = Daytime temperature - Change in temperature

Given that the daytime temperature is 9 degrees Celsius and the nighttime temperature drops by 16 degrees Celsius, we can substitute these values into the equation:

Nighttime temperature = 9 - 16

Simplifying the equation:

Nighttime temperature = -7

Therefore, the equation to express the change in temperature from daytime to nighttime in Sutherland is:

Nighttime temperature = 9 - 16 = -7 degrees Celsius.