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1) 4x + 5y = 21
2) -4x + 8y = - 8
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0x + 13y = 13
13y = 13
y = 13/13
y = 1
Reemplazo y = 1 en ecuación 1.
4x + 5y = 21
4x + 5 (1) = 21
4x + 5 = 21
4x = 21 - 5
4x = 16
x = 16/4
x = 4
Solución :
x = 4
y = 1
Te ayudo con la primera, son muchas. Tienes que publicar una por una.