Solve the system 8x + 2y = -3, 3x - 2y = 8

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

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What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83