by Guest » Tue Aug 28, 2018 12:35 am
Lets length-a,width-b. The two sentences turned into equations.
[tex]\begin{array}{|l} a+3=2b \\ 2(a+b)=54 /:2 \end{array}[/tex]
[tex]\begin{array}{|l} a=2b-3 (we- are- replacing)\\ a+b=27 \end{array}[/tex]
2b-3+b=27 [tex]\Leftrightarrow[/tex] b=10 ;we know a=2b-3 [tex]\Leftrightarrow[/tex] a=2.10-3=17
a=17 centimeters ;b=10 centimeters