$\"\"$

The slope m of a non vertical line through any two points is given by,

$\"\"$

$\"\"$ (Substitute 0 for x₁, r for x₂, 0 for y₁ and s for y₂)

$\"\"$

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

Slope $\"\"$

$\"\"$

The slope m of the line that passes through the pair of points is $\"\"$ .