1.

**sides:**x=0 x=-8

y=0, y=-6

**Diagonal AC :**`y=6/8 x=3/4x`

Diagonal BD: slope`=(-6-0)/(0-(-8))=-6/8=-3/4`

Slope point equation

`y-0=-(3/4)(x-(-8))`

**Equation of BD:** `y=-(3/4) x+8`

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