Question 693982
L=Length W=Width A=Area
L=3W
so LW=A  is really 4W=A or 3W(W)=A
W-1
L+3=3W+3
A=72 for second rectangle
{{{(3W+3)(W-1)=72}}}
{{{3W^2-3=72}}}
{{{3W^2-75=0}}}
do the quadratic formula
to get {{{3(W-5)(W+5)=0}}}
two possible answers are 5,-5 however there can not be negative lengths so possitive 5 is what W equals
L=3W so L=15 and W=5
so A=75