Seudónimo
Seudónimo
11-04-2018
Mathematics
contestada
plz help ty :)))))))))
Respuesta :
Аноним
Аноним
12-04-2018
3x - 3y = -12 ------------- (1)
7x + 2y = -19 --------------(2)
(1) x 2 :
6x - 6y = - 24 ----------- (1a)
(2) x 3 :
21x + 6y = -57 ----------- (2a)
(1a) + (2a) :
27x = - 81
x = - 3
Sub x = -3 into (1)
: 3(-3) - 3y = - 12
y = - 12 + 9
y = - 3
Answer( -3, -3)
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