Question

Помогите даю 50 баллов. Срочно！！！！！！

Answer 1

умножим первое на 15, второе на 6:

{k + y - 5(k - y) = 15
{2k - y  - 2(3k + 2y) = -25*6

{k - 5k + y + 5y = 15
{2k - y - 6k - 4y = -150

{6y - 4k = 15
{-4k - 5y = -150

{-4k = 15 - 6y
{15 - 6y - 5y = -150

{k = (6y - 15)/4
{-11y = -165

{y = 15
{k = (90 - 15)/4 = 18,75

Answer 2

                 $left { {{k+y-5k+5y=15} atop {2k-y-6k-4y=-150}} right. left { {{4k-6y=-15} atop {4k+5y=150}} right. left { {{4k=-15+6y} atop {-15+6y+5y=150}} right. left { {{4k=-15+6y} atop {11y=165}} right. left { {{y=15} atop {k=75/4}} right.$