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xavier is thinking of a number. nine more than four times the number is the same as fifteen less than twice the number. what is xavier's number?
(equation: 4x + 9 = 15 - 2x)
solve for x

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.

step-by-step explanation: