[tex]\displaystyle\bf\\\left \{ {{5k = 14 \: \: | \div 5} \atop {k + m = - 6 }} \right. \\ \displaystyle\bf\\\left \{ {{k = 2.8} \atop {2.8 + m = - 6 }} \right. \\ \\ m = - 6 - 2.8 \\ m = - 8.8 \\ \displaystyle\bf\\otvet \: \: \: \: \left \{ {{k = 2.8} \atop {m = - 8.8 }} \right. \\ \\ [/tex]