Question 108524
1.{{{P=2W+2L=78}}} Perimeter of a rectangle using length and width.
2.{{{L=11+3W}}} Relationship between L and W.
Substitute in 1 for L using 2.
1.{{{2W+2L=78}}}
{{{2W+2(11+3W)=78}}}
{{{2W+22+6W=78}}}
{{{8W+22=78}}}
{{{8W=56}}}
{{{highlight(W=7)}}}
2.{{{L=11+3W}}}
{{{L=11+3(7)}}}
{{{L=11+21}}}
{{{highlight(L=32)}}}
Check your answer using 1.
{{{2W+2L=78}}}
{{{2(7)+2(32)=78}}}
{{{14+64=78}}}
{{{78=78}}}
True statement.
Good answers.