What is the answer to -13= 9/r+8 ?

The answer to -13= 9/r+8 is r=-3/7

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-13= 9/r+8

- 13 = \frac{9}{r} + 8

r = - \frac{3}{7}

Decimal Notation

r = - 0.42857 \dots

Solution steps

- 13 = \frac{9}{r} + 8

Move

8

to the left side

- 21 = \frac{9}{r}

Multiply both sides by

r

- 21 r = 9

Divide both sides by

- 21

r = - \frac{3}{7}

Verify Solutions

Find undefined (singularity) points:

r = 0

Combine undefined points with solutions:

r = - \frac{3}{7}

x^{4} + \frac{1}{x ^{2}} = 2

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

14.8 = \frac{0.693}{k}

\frac{20}{3} = \frac{5}{h}

\frac{2}{x + 1} = \frac{1}{5}