What is the answer to (-4)/(r+9)= 7/(-2) ?

The answer to (-4)/(r+9)= 7/(-2) is r=-55/7

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

(-4)/(r+9)= 7/(-2)

\frac{- 4}{r + 9} = \frac{7}{- 2}

r = - \frac{55}{7}

Decimal Notation

r = - 7.85714 \dots

Solution steps

\frac{- 4}{r + 9} = \frac{7}{- 2}

Cross multiply

8 = (r + 9) \cdot 7

Switch sides

(r + 9) \cdot 7 = 8

Divide both sides by

7

r + 9 = \frac{8}{7}

Move

9

to the right side

r = - \frac{55}{7}

Verify Solutions

Find undefined (singularity) points:

r = - 9

Combine undefined points with solutions:

r = - \frac{55}{7}

x, f = \frac{1}{x}

14 + \frac{8}{x} = 16

2 - \frac{2}{x ^{2}} = 0

(x - 1)^{- 1} = x^{- 1} + x

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

What is the answer to (-4)/(r+9)= 7/(-2) ?
The answer to (-4)/(r+9)= 7/(-2) is r=-55/7
Solve for r: (-4)/(r+9)= 7/(-2)
The solution is r=-55/7