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25-10-2017
Mathematics

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The difference of twice a number and 9 is at least −15

Use the variable b for the unknown number.

PLEASE HELP!

Respuesta :

25-10-2017

Difference means subtraction (-)
Twice a number means × 2
is at least ≥

Put it all together
2b - 9 ≥ -15

Then you can solve for b
2b - 9 ≥ -15
2b ≥ -15 + 9
2b ≥ - 6
b ≥ - 6/2
b ≥ - 3

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