Question 969383
x, y, z, in that order;
{{{x=z/2}}};
{{{y=-9+z}}};
{{{x+y+z=51}}}
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Assumed z is the longest side.  The third side is y.



Substitute for x and y in the perimeter equation.
{{{z/2+z-9+z=51}}}
{{{z/2+2z-9=51}}}
{{{z/2+2z=60}}}
{{{z+4z=120}}}
{{{5z=120}}}
{{{highlight(z=24)}}}


Find the others.