Question 473315
{{{Ax+By=C}}}
#1  {{{3y+9x-18=0}}} we have to write the term with x on the first place ({{{9x}}}) with y on the secone place ({{{3y}}}) and the term without x or y after =, then we will have {{{Ax+By=C}}}
{{{9x+3y=18}}}divide by 3
{{{3x+y=6}}}
.
#2  {{{6y-2x=8}}}
{{{-2x+6y=8}}} divide by -2
{{{x-3y=-4}}}
.
#3  {{{y=9x+12}}}
{{{-9x+y=12}}}