Объяснение:
{3х-4у= - 7
{2х+3у=1
3х-4у= '7
-4у= - 7-3х
У=3/4х+7/4
Х 0 - 7/3
У 7/4 0
2х+3у=1
3у=1-2х
У= - 2/3х+1/3
Х 0 1/2
У 1/3 0
Решение точка пересечения (-1;1)
3/4х+7/4= - 2/3х+1/3
3/4х+2/3х=1/3-7/4
3/4х+2/3х= - 17/12
9х+8х= - 17
17х= - 17
Х= - 1
У=3/4х+7/4=3/4×(-1)+7/4= - 3/4+7/4= 1
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Объяснение:
{3х-4у= - 7
{2х+3у=1
3х-4у= '7
-4у= - 7-3х
У=3/4х+7/4
Х 0 - 7/3
У 7/4 0
2х+3у=1
3у=1-2х
У= - 2/3х+1/3
Х 0 1/2
У 1/3 0
Решение точка пересечения (-1;1)
3/4х+7/4= - 2/3х+1/3
3/4х+2/3х=1/3-7/4
3/4х+2/3х= - 17/12
9х+8х= - 17
17х= - 17
Х= - 1
У=3/4х+7/4=3/4×(-1)+7/4= - 3/4+7/4= 1