What is the answer to 4/r = 5/7 ?

The answer to 4/r = 5/7 is r= 28/5

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4/r = 5/7

\frac{4}{r} = \frac{5}{7}

r = \frac{28}{5}

Solution steps

\frac{4}{r} = \frac{5}{7}

Cross multiply

28 = r \cdot 5

Switch sides

r \cdot 5 = 28

Divide both sides by

5

r = \frac{28}{5}

Verify Solutions

Find undefined (singularity) points:

r = 0

Combine undefined points with solutions:

r = \frac{28}{5}

\frac{2}{x - 1} + 3 = 0

1 - \frac{3}{x} = \frac{4}{5}

\frac{x}{5} = \frac{x}{x - 5} - 1

1 + \frac{1}{x} = 10

\frac{3}{x} + \frac{2}{3} = 2