Mathematics

Mathematics

Problem

Let

a

and

b

be integers,

0 < b < a

. The image of the point

A(a, b)

in the line

y=x

is

B

, the image of

B

in the

y

-axis is

C

, the image of

C

in the

x

-axis is

D

and the image of

D

in the

y

-axis is

E

. If the area of the pentagon is 451, then

a - b =

(a) 1 (b) 2 (c) 3 (d) 5

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