<PRE><B>Question 176428</B>
{{{y-7=-9(x-2)}}} Start with the given equation.



{{{y-7=-9x+(-9)(-2)}}} Distribute



{{{y-7=-9x+18}}} Multiply {{{-9}}} and {{{-2}}} to get {{{18}}}



{{{y=-9x+18+7}}} Add 7 to both sides.



{{{9x+y=18+7}}} Add 9x to both sides.



{{{9x+y=25}}} Combine like terms.



So the equation is now in standard form {{{Ax+By=C}}} where {{{A=9}}}, {{{B=1}}}, and {{{C=25}}}</PRE>