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Easy: y = kx from a ratio table
In a table of equivalent ratios, every y is the same multiple of x, so y = kx. In other tables y may be x plus a fixed number, so y = x + k. Check the rule against every column.
Write an equation for y in terms of x.
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Divide each y by its x. If the quotient is the same every time, the rule is y = kx. If instead y − x is the same every time, the rule is y = x + k.
y, because its value depends on the value chosen for x. x is the independent variable.
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