Can someone help me pls guys?​

Solve: 3x+y=6 4x-2y=18 show all work !

What is the value of x in the following equation? -3x-2=2x+8

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x