$\"\"$

Observe that y-coordinates of two points are same. Therefore the line is,

Horizontal, then the slope is zero.

Verify the solution:

Slope formulae $\"\"$ .

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Subtract: $\"\"$ )

$\"\"$ (Apply Additive inverse property: $\"\"$ )

$\"\"$ (Divide: $\"\"$ ) $\"\"$

Slope is $\"\"$ .