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What value of rr is a solution to this equation?\newline7r=217r = 21\newlineChoices:\newline(A) r=1r = 1\newline(B) r=3r = 3

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Full solution

Q. What value of rr is a solution to this equation?\newline7r=217r = 21\newlineChoices:\newline(A) r=1r = 1\newline(B) r=3r = 3
  1. Identify Operation: Which operation should be used to isolate rr?\newlineIn 7r=217r = 21, we should divide both sides by the coefficient of rr to isolate it.\newlineDivide by 77.
  2. Divide by 77: r=217r = \frac{21}{7}\newlineFind the value of rr.\newline217=3\frac{21}{7} = 3\newliner=3r = 3

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