If $a=4k+7r$ and $b=9k-11r+5$ which expression is equivalent to $a - … | Ronan SAT

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Question

Prompt

If

a = 4 k + 7 r

and

b = 9 k - 11 r + 5

which expression is equivalent to

a - b

?

- 5 k + 18 r + 5

A

- 5 k + 18 r - 5

B

- 5 k - 4 r - 5

C

- 5 k - 4 r + 5

D