# Please, give examples of two variables with perfect positive and perfect negative linear correlation

Please, give examples of two variables that have a perfect positive linear correlation and two variables that have a perfect negative linear correlation.
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Perfect positive linear correlation:
Correlation coefficient value is +1 then the two variables have perfect positive correlation.

Perfect negative linear correlation:
Correlation coefficient value is -1 then the two variables have perfect negative correlation.

Example of perfect positive linear correlation is: income and expenditure, heights and weights of a group of persons.

Example of perfect negative linear correlation: price and demand of a commodity, the volume and pressure of a perfect gas.