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Denisukka
a fost răspuns

8. acolada mare: x+3(y-1) = -10
3(x-1)+y =-8

9.acolada mare: 4(x-2y)- 3 (2x+y) = 90
3(x-y)-2(x+y) =60

Răspuns :

Lorena2000
x+3y-3=-10⇒x+3y=-7
3x-3+y=-8⇒3x+y=-5⇒9x+3y=-15
(le scadem)⇒8x=-8⇒x=-1⇒3y=-7+1=-6⇒y=-2

4x-8y-6x-3y=90⇒-2x-11y=90⇒2x+11y=-90
3x-3y-2x-2y=60⇒-1x-5y=60⇒x+5y=-60⇒2x+10y⇒=-120
(le scadem)⇒y=30⇒x=-60-5y=-60-150=-210