Question

Translate the sentence into an equation.

Twice the difference of a number and 8 equals 5.
Use the variable b for the unknown number.

Answer 1

b = 10.5

Explanation:

The difference of b and 8 is b - 8 and twice this difference is

2(b - 8) = 5 ← distribute parenthesis on left side

2b - 16 = 5 ( add 16 to both sides )

2b = 21 ( divide both sides by 2 )

b = 10.5

The unknown number b is 10.5

Answer 2

it's simple it means

2×b-8=5