Identify the two points or the line’s equation
Use the slope formula: m = (y2 – y1) / (x2 – x1)
Substitute the coordinates into the formula
Simplify the numerator and denominator
Reduce the fraction if possible
If given an equation, rewrite it in slope-intercept form: y = mx + b
Compare the equation to y = mx + b to find the slope
If solving for a missing value, substitute the known slope and coordinates into the slope formula
Cross-multiply if needed
Solve for the unknown variable
Check the result by substituting it back into the original equation or formula