Question 34727
Just add the 2 equations, that way you get rid of the 'y' term

you get {{{ -5x = -54 }}}
so, x = 10.8

use this value of x in either equation, say in eqn#1, so
  {{{ 10.8 - 4y = -18 }}}
so, -4y = -28.8 and y = 7.2