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Tamiku [17]
3 years ago
8

How can I do this exercise?

%202%7D" id="TexFormula1" title="\frac{-2}{12} = \frac{x + 1}{x + 2}" alt="\frac{-2}{12} = \frac{x + 1}{x + 2}" align="absmiddle" class="latex-formula">
Mathematics
1 answer:
matrenka [14]3 years ago
3 0

Answer:

-8/7 =x

Step-by-step explanation:

-2         x+1

----- = -----------

12         x+2

Using cross products

-2 (x+2) = 12 (x+1)

Distribute

-2x -4 = 12x+12

Add 2x to each side

-2x+2x -4 = 12x+2x+12

-4 = 14x +12

Subtract 12 from each side

-4-12 = 14x

-16 = 14x

Divide each side by 14

-16/14 =14x/14

-8/7 =x

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