Question

Найдите решение систем уравнений:
No1
1) (y+ 2х = 3
6х + 5 y = 19

2) (y+ 4x=5
3х + 7y = 60

3) (x+3y = 1
4х + 9y = 16

4) (x+2y = 2
2х + 11y = 10​

Answer 1

1){у+2х=3

{6х+5у=19

{у=3-2х

{6х+5у=19

6х+5(3-2х)=19

х=-1

у=5

2)

{у+4х=5

{3х+7у=60

{у=5-4х

{3х+7у=60

3х+7(5-4х)=60

х=1

у=9

3)

{х+3у=1

{4х+9у=16

{х=1-3у

{4х+9у=16

4(1-3у)+9у=16

у=-4

х=13

4)

{х+2у=2

{2х+11у=10

{х=2-2у

{2х+11у=10

2(2-2у)+11у=10

у=6/7

х=2/7

/ дробь