Help! Look at the photo provided!

It's the first choice.

Step-by-step explanation:

The first term is the value of n / (2n +1) when n = 1

So first term = 1 (2 + 1) = 1/3

Second term = 2/(2(2) + 1) = 2/5

Third term = 3 / (3(2) + 1) = 3/7  and so on.

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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