What is the common difference in the following arithmetic sequence? n an 1 –12 2 –1 3 10 4 21 –11 –1 1 11

11 is the common difference of the given sequence.

Step-by-step explanation:

Here the given sequence is

Terms           1          2           3        4    

Sequence   -12       -1          10        21

Now we know the arithmetic sequence is -12, -1, 10, 21n terms

common difference of an arithmetic sequence is represented as difference of nth term and (n-1)th term.

Therefore common difference d = -1 - (-12) = -1 +12 = 11

common difference 11 is the right answer.

your answer would be b

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18