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What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)