Solve each system without graphing 2d = 8f, 18 - 4f = 2d, find a substitute

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

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  or  

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if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

your question is incomplete, write all the numbers in the sequence that it tells you.  

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70.30

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