05-08-2020
Mathematics

contestada

Twice the difference of a number and 9 is 3. Use the variable b for the unknown number.

Twice the difference of a number and 9 is 3 Use the variable b for the unknown number class=

Respuesta :

zarampa zarampa

09-08-2020

Answer:

b = 10.5

Step-by-step explanation:

2(b-9) = 3

then:

2*b + 2*-9 = 3

2b - 18 = 3

2b = 3 + 18

2b = 21

b = 21/2

b = 10.5

check:

2(10.5 - 9) = 3

2*1.5 = 3

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