In the system –12c + 3d = 6 and –3c + 6d = –9, which expression could you use for substitution? a. d = –1/2c – 3/2 b. c=-2d+3 c. c = 1/4d – 1/2 d. d = 4c – 2

–12c + 3d = 6

12c = 3d - 6

c = 1/4 d - 1/2

Answer is

C. c = 1/4 d – 1/2

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y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.