Question 951997
help soving each system of linear equations bysubstitution
 -4x+y=6
 -5x-y=21
--------
Modify::
y = 4x+6
y = -5x-21
-------
Substitute to get:
4x+6 = -5x-21
9x = -27
x = -3
-----
Solve for "y"::
y = 4(-3)+6
y = -6
--------------
Cheers,
Stan H.
---------------