Question

When an integer `b` is subtracted from another integer `a`, the difference is 105. If `a=66`, what is `b`?

Answer 1

If `a-b=105` and `a is 66` you can find b as `-39`

Explanation:

b is -39 due to the fact that

`a-b=105` and if `a=66`

`-b=105-66=39`

or `b=-39`

Your answer is -39.

Answer 2

`b=-39`

Explanation:

`"expressing as a mathematical statement"`

`a-b=105larr" solve for b"`

`rArr66-b=105`

`"subtract 66 from both sides"`

`cancel(66)cancel(-66)-b=105-66`

`rArr-b=39larr" multiply through by - 1"`

`rArrb=-39`