log2(x-y)=1 и 2x3y+1=72 помогите

x-y=2x=2+y2(2+y)*3y+1=726y²+12y-71=0D=144+1704=1848y1=(-12-2√462)/12=-1-1/6*√462x1=1-1/6*√462y2=-1+1/6*√462x2=1+1/6*√462