Linear approximation

Linear approximation is when you try to find an approximate answer that is close to the real answer by looking at a chart or graph. For example, if you have a table that shows how different amounts of apples are related to how much money it costs, you can use linear approximation to estimate how much money it will take to buy a certain amount of apples. You do this by looking at the chart and then picking two points that are close to the amount of apples you want to buy. Then you draw a straight line connecting these two points. Now you can use this line as a guide to estimate how much money it will cost to buy the amount of apples you need.