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2 years ago

13

2 x— = -----7 x + 10x = ???

1 answer:

valentina_108 [34]2 years ago

6 0

9514 1404 393

Answer:

x = 4

Step-by-step explanation:

Maybe you want to find x such that ...

2/7 = x/(x +10)

2(x +10) = 7x . . . . . . multiply by 7(x+10)

20 = 5x . . . . . . . . . . subtract 2x, simplify

4 = x . . . . . . . . . . . . divide by 5

_____

<em>Additional comment</em>

You can almost solve this "by inspection" if you recognize the difference of the denominator and numerator is 5 on the left and 10 on the right. If you multiply the fraction on the left by 2/2, you get 4/14, the values in x/(x+10) in the fraction on the right.

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