They help you by stating or writting down things on a graph
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Its easy its like the most popular graphs u usually hear.
They allow scientist to identify trends and make predictions
Bar and line graphs each have at least two labeled axes, and usually a legend.
This question cannot be answered without the circle graphs provided.
Because cause and effect relationships in economics or in any other subject can be better explained with help of graphs. It also tells us what is the effect of one variable on other and how it responds to change in that variable. So instead of using words, graphs offer an easy and better way of showing relationships between two variables.