Question

Решить срочноооооооооо

Answer 1

4x = -6y             
7y-2x =20
~~~~~~~~
x=-6y/4
7y-2x =20
~~~~~~~~~
x = -3y/2
7y-(2*(-3y/2))=20
~~~~~~~~~~~~~~
x = -3y/2
7y+3y=20
~~~~~~~~~
x = -3y/2
10y=20
y=2
~~~~~~~
y=2
x = -3*2/2
~~~~~~~~
x= -3
y=2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8x - 3y = 7
3x + y = 9
~~~~~~~~~
y = 9 - 3x
8x -3(9 - 3x) = 7 
~~~~~~~~~~~~
y = 9 - 3x
17x = 34
~~~~~~~~~
x = 2
y = 9 - 3x
~~~~~~~
x = 2
y = 9 - 3*2
~~~~~~~~
x = 2 
y = 3