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-3 +y = -10 (2)
de (2)
-3 + y = -10
y = -10+3
y = -7
este valor lo sustituyo en (1)
x +2y = 1
x +2(-7) = 1
x -14 = 1
x = 14+1
x = 15
solucion
x = 15
y = -7
comprobamos remplazando los valores en (1)
15 -2(-7) = 1
15-14 = 1
1 =1