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2. -10m - 4n = -1
despejo m en la ecuación 1 y sustituyo en 2 para resolver por sustitución
4m = 5 - 5n
m = 5/4 - 5/4n
-10(5/4 - 5/4n) - 4n= -1
-25/2 + 25/2n - 4n = -1
17/2n = -1 + 25/2
n= 23/2 : 17/2
n = 23/17
reemplazo donde despejé m para hallar n
m = 5/4- 5/4 * 23/17
m = 5/4 - 115/68
m= -15/34
saludos