The vertex would be at (3, 6).
X and y are books
x is fiction
y=nonifiction
x+y=36
x=12+y
12+y+y=26
2y+12=26
minus 12
2y=14
divide 2
y=7
sub
x=12+y
x=12+7
x=19
nonfiction=7
Answer:
i think it's c but I'm rly not sure on this one...
Multiple 15 times 8 and that is your answer
