If the solution of the system of equations {x + y = 8m, X-Y = 2m satisfies 2x-5y = 1, the value of M is obtained

If the solution of the system of equations {x + y = 8m, X-Y = 2m satisfies 2x-5y = 1, the value of M is obtained

From formula x + y = 8m, formula X-Y = 2m, formula 1 + 2 = x + y + X-Y = 8m + 2m = 2x = 10m = x = 5m, substituting 5m into x + y = 8m or X-Y = 2m, formula y = 3M is obtained, and formula 2x-5y = 1 is transformed into formula 10m-15m = 1 - 5m = 1m = -