Answer:
7 x 12
Step-by-step explanation:
[tex]a=l *w[/tex]
[tex]84=l*w\\w=l+5\\[/tex]
these equations we know, so we can use them like this
[tex]84=l*(l+5)\\84=l^2 +5l\\[/tex]
I then plugged this equation into the desmos calculator to get the answer
[tex]l=7[/tex]
we then plug this into a previous equation
[tex]w=l+5\\w=7+5\\w=12[/tex]
to get our answer l=7, w=12
