Which formula can be used to find the nth term of a geometric sequence where the first term is 8 and the common ratio is –3?

f(n)=8(-3)^(n-1)

When you multiply the equation 1 by 1, then it won't change and will be:
6x − 2y = 3
Now, when you'll add 2nd equation to it, then, it is:
= 11x + y = 7

In short, Your Answer would be Option D) Show that the solution to the system of equations 11x + y = 7 and 5x + 3y = 4 is the same as the solution to the given system of equations

Hope this helps!