What is the answer to y/5 =(20)/y ?

The answer to y/5 =(20)/y is y=10,y=-10

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y/5 =(20)/y

\frac{y}{5} = \frac{20}{y}

y = 10, y = - 10

Solution steps

\frac{y}{5} = \frac{20}{y}

Cross multiply

y^{2} = 100

Solve

y^{2} = 100 : y = 10, y = - 10

y = 10, y = - 10

Verify Solutions

Find undefined (singularity) points:

y = 0

Combine undefined points with solutions:

y = 10, y = - 10

\frac{1}{x} = \frac{2}{10}

2 - \frac{5}{2 b} = \frac{2 b}{b + 1}

x = \frac{1}{x} + 4

1 + \frac{4}{y} = \frac{11}{12 y}

x, y = \frac{1}{x - 3}