Question

розвяжіть систему рівнянь { 6x+3y=6,15 y-x = 1,3​

Answer 1

$\displaystyle\bf\\\left \{ {{6x + 3y = 6.15} \atop { - x + y = 1.3 \: \: | \times 6}} \right. \\ \displaystyle\bf\\ + \left \{ {{6x + 3y = 6.15} \atop { - 6x + 6y = 7.8 }} \right. \\ \\ 3y + 6y = 7.8 + 6.15 \\ 9y = 13.95 \\ y = 13.95 \div 9 \\ y = 1.55 \\ \\ - x + 1.55 = 1.3 \\ x = 1.55 - 1.3 \\ x = 0.25$

Ответ: ( 0,25 ; 1,55 )