Respuesta :

datgamer13

The first equation is open, since it has an unsolvable variable. 1x could be anything!

The second equation is false, because 20 - 11 = 9    not 11.

The last equation is true,  7 + 10 does equal 17!

suspho

1x + 4 = 10

x = 10 - 4

x = 6 (true)

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20 - 11 = 11

20 - 11 = 9 (false)

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7 + 10 = 17 (true)