Question 201278
{{{x + y = 18}}} double this
{{{2x+2y = 36}}}
{{{3x+2y = 44}}}subtract these two
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{{{-x    = -8}}}
{{{x = 8}}}
{{{x + y = 18}}}
{{{8 + y = 18}}}
{{{y = 10}}}
Use this to check your answer
http://www77.wolframalpha.com/input/?i=x%2By%3D18%2C+3x%2B2y%3D44