2(y+12)=y-9

8(-1+m)+3 = 2 [m-5 1/2]

8(12-k)=3(k=k+21)

2y-3(2y-3)+2=31

solve for the variables

show all your work

Since it has 8 sides, it is an octagon.
This table will help
triangle (or trigon)--3
quadrilateral (or tetragon)--4
pentagon--5
hexagon--6
heptagon--7
octagon--8
nonagon (or enneagon)--9
decagon--10
hendecagon (or undecagon)--11
dodecagon (or duodecagon)--12
tridecagon (or triskaidecagon)--13
tetradecagon (or tetrakaidecagon)--14
pentadecagon (or pentakaidecagon)--15
hexadecagon (or hexakaidecagon)--16
heptadecagon (or heptakaidecagon)--17
octadecagon (or octakaidecagon)--18
enneadecagon (or enneakaidecagon)--19
icosagon--20
icositetragon (or icosikaitetragon)--24
triacontagon--30
tetracontagon (or tessaracontagon)--40
pentacontagon (or pentecontagon)--50.
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