The temperature of Place Y at 4000m above sea level is -8°C.
Linear equation
A linear equation is in the form:
y = mx + b
where y, x are variables, m is the rate of change and b is the initial value of y.
Let y represent the temperature above sea level after x thousand meters.
Given that temperature decrease by 6.5 degrees C for every 1000 meters you gain. Hence for 4000m above sea level:
y = -6.5(4) + 18 = -8°C
The temperature of Place Y at 4000m above sea level is -8°C.
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