[tex]2.\\x = -1, \ \ y = 3\\\\A.\\2x+3y = 2\cdot(-1) +3\cdot3 = -2+9 = 7\\5y-2x = 5\cdot3 - 2\cdot(-1) = 15 + 2 = 17 \neq 13\\\\B.\\2x+3y = 2\cdot(-1)+3\cdot3 = -2+9 = 7\\3y-2x = 3\cdot3 -2\cdot(-2) = 9+4 = 13 \neq 11\\\\C.\\4x+3y = 4\cdot(-1)+3\cdot3 = -4+9 = 5\\2y-x = 2\cdot3 - (-1) = 6+1 = 7\\\\D.\\-2x+y = -2\cdot(-1) + 3 = 2+3 = 5\\3x+2y = 3\cdot(-1)+2\cdot3 = -3+6 = 3\\\\Odp. \ C. \ i \ D.[/tex]
3.
1% = 1/100 = 0,01
{a = 0,2b
{0,4a + 0,3b = 16
