The population of bacteria is directly proportional to the temperature. There are about 10 million bacteria at 20 degrees Celsius. Create a formula for this. What type of variation is this?  What is k? How many bacteria will there be at 30 degrees celsius? Where else would I use this?

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.