If $a=6k+5r$ and $b=9k-12r+3$, which expression is equivalent to $a-b… | Ronan SAT

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Question

Prompt

If

a = 6 k + 5 r

and

b = 9 k - 12 r + 3

, which expression is equivalent to

a - b

?

- 3 k + 17 r - 3

A

- 3 k + 17 r + 3

B

- 3 k - 7 r + 3

C

- 3 k - 7 r - 3

D