A rule is the relationship between two quantities. For example, a student's weekly allowance is 1010 USD. The relation between the amount of money yy after xx weeks can be expressed as: y=10x. y=10x. For example, the rule can be used to calculate the amount of money the student earned after 44 weeks, 104=40 USD. 10\cdot {\color{#0000FF}{4}} = 40 \text{ USD.}

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