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