Answer
$x = 1$
$y = -1$
Work Step by Step
$4x - y = 5$
$3x - 3 = 0$
Therefore
$4x - y = 5$
$3x = 3$
$a = 4$ , $b = -1$, $c = 3$, $d = 0$, $h = 5$, $k = 3$
lets calculate
$D = ad-bc = 0 + 3= 3$
$D_x = hd-bk = 0+3 = 3$
$D_y = ak-ch= 12-15= -3$
Therefore by Cramer's rule,
$x = \frac{D_x}{D} = \frac{3}{3} = 1$
$y = \frac{D_y}{D} = \frac{-3}{3} = -1$