Question 417553

{{{Width = W}}}

{{{Length  =L}}}  ...the length of a rectangular board is {{{9m}}} greater than 

the width ; so, we have 


{{{L=W+9m}}}


{{{perimeter=P}}}

use formula

{{{P=2(L+W)}}}

{{{26m=2(L+W)}}}...replace {{{L}}} with {{{W+9m}}}


{{{26m=2(W+9m+W)}}}

{{{26m=2W+18m+2W}}}


{{{26m=4W+18m}}}


{{{8m=4W}}}

{{{8m/4=W}}}

{{{2m=W}}}........now find {{{L}}}


{{{L=W+9m}}}
{{{L=2m+9m}}}

{{{L=11m}}}


check:


{{{26m=2(11m+2m)}}}

{{{26m=2(13m)}}}

{{{26m=26m}}}