$\"\"$

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

$\"\"$

Substitute $\"\"$ in slope formula.

$\"\"$

$\"\"$ (Subtract: 5 – 4 = 1) $\"\"$

$\"\"$ (Add 3 to each side)

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

$\"\"$ (Add: 3 + 3 = 6) $\"\"$

The value of $\"\"$ .