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5x+7y = -1 ec. 1
-3x+4y = -24 ec. 2
Si multiplicamos por 3 a la ec. 1 y por 5 a ala ec. 2:
15x + 21y = -3
-15x +20y = -120
Al sumarlas queda:
41y = -123
y = -123/41
y = -3
Sustituyendo valores en la ec. 1:
5x + 7*-3 = -1
5x -21 = -1
5x = -1+21
5x = 20
x = 20/5
x = 4
Ahora comprobemos sustituyendo valores en al ec. 2:
-3*4 + 4*-13 = -24
-12-12 = -24
-24 = -24
Saludos...