x = 0
y = 0
Factor of proportionality: 0
What is a proportionality?A proportionality is a relation fulfilling: The more one value grows, the more another value grows. E.g. if you buy more fruits, the price of the fruits will also increase.
How to calculate with proportionalities?First find out what the proportionality factor is. This the value gotten by dividing two corresponding values.
It is easy to find values corresponding to other numbers: Just multiply or divide by the factor of proportionality.