Question 1067374
{{{system(x+y=57,-2x+y=9)}}}


{{{x+(9+2x)=57}}} through substitution


{{{3x+9=57}}}


{{{3x=48}}}


{{{highlight(x=16)}}}
-
{{{y=41}}}



CHECK:
{{{-2*16+41}}}
{{{41-32}}}
{{{9}}}---------checks okay