Question 1098649
Parts x and y

{{{system(x+y=200, y/4-x/3=8)}}}


{{{better}}}:
{{{system(x+y=200,3y-4x=96)}}}


-


{{{3(200-x)-4x=96}}}
{{{600--3x-4x=96}}}

{{{-7x=96-600}}}
{{{7x=600-96}}}
{{{highlight(x=72)}}} and {{{highlight(y=128)}}}.