Rozwiąż układ równań :
a) (2x-5)*2x-4(x do kwadratu +1)=1
b)5x+2-4(2x-1) > -3
c){9x-3y=6
{6x+y=-2
d){x/4+y/6=2
{3x-2y=0
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a) 4x do kwadratu - 10x - 4x do kwadratu - 4 =1
-10x =5 /(-10)
x= -2
b) 5x +2 -8x + 4 >-3
-3x>-9 /(-3)
x<3