To find the slope of a line given two points [tex]\((x_1, y_1)\)[/tex] and [tex]\((x_2, y_2)\)[/tex], we use the slope formula. The slope [tex]\(m\)[/tex] describes the steepness or incline of the line and is calculated as the change in the vertical direction ([tex]\(y\)[/tex]) divided by the change in the horizontal direction ([tex]\(x\)[/tex]) between two points on the line.
The correct formula is:
[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]
By recognizing the correct option from the given choices, we circle:
[tex]\[ \boxed{B} \ m=\frac{y_2-y_1}{x_2-x_1} \][/tex]