ax−3y=−165x+by = −3
x=5, y=7
{5a-21 = -3
{-825+7b = -3
5a= - 3+21
5a=18
a=18:5
a=18/5=3 3/5
7b= -3+825
7b= 822
b=822:7
b=822/7=117 3/7
ответ: а=3 3/5; b=117 3/7
ax−3y=−165x+by = −3
x=5, y=7
{5a-21 = -3
{-825+7b = -3
5a= - 3+21
5a=18
a=18:5
a=18/5=3 3/5
7b= -3+825
7b= 822
b=822:7
b=822/7=117 3/7
ответ: а=3 3/5; b=117 3/7