$A ( 0,2 )$ and $C ( 4,0 )$ are opposite vertices of the square $A B C D$. What is the equation of the straight line through $B$ and $D$ ?
A $y = - 2 x + 5$
B $y = - \frac { 1 } { 2 } x - 3$
C $y = - \frac { 1 } { 2 } x + 2$
D $y = x$
E $y = 2 x - 3$ F $y = 2 x + 2$
..... 4
$A ( 0,2 )$ and $C ( 4,0 )$ are opposite vertices of the square $A B C D$.\\
What is the equation of the straight line through $B$ and $D$ ?

A $y = - 2 x + 5$\\
B $y = - \frac { 1 } { 2 } x - 3$\\
C $y = - \frac { 1 } { 2 } x + 2$\\
D $y = x$\\
E $y = 2 x - 3$\\
F $y = 2 x + 2$