Question 954681
{{{system(j=p+3,j=L-2,j+p+L=62)}}}


Use substitution method for beginner's level method.



Notice {{{j=p+3=L-2}}},
*   {{{p-L=-5}}}
{{{p=L-5}}}


{{{(p+3)+p+L=62}}}
{{{2p+L+3=62}}}


Use the starred equation again to solve for L in terms of p:
{{{L=p+5}}}
-
{{{3p+(p+5)+3=62}}}
{{{4p+5+3=62}}}
{{{4p=62-8}}}
{{{4p=54}}}
{{{p=54/4}}}
{{{highlight(p=13&1/2)}}}, and use this in the other equations, any that have p and either of L and j.  Easiest to refer to the first two equations of the original system.