Michael J. answered • 05/15/17

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We need to find the first term. We can use the formula

a

_{n}= a_{1}+ d(n - 1)to solve for a

_{1}. We already know the 12th term, a_{12}, common difference, d, and nth sequence, n.a

_{12}= -36d = -4

n = 12

-36 = a

_{1}- 4(12 - 1)-36 = a

_{1}- 448 = a

_{1}The first term is 8. Therefore, your formula is

a

_{n}= 8 - 4(n - 1)**a**

_{n}= -4n + 12Then use this formula to graph.

n is the independent variable.

a

_{n}is the dependent variable.Your graph will be a line.

n | a

_{n}___________

1 8

2 4

3 0

4 -4

5 -8

6 -12