Update Unit 5: Analytical Geometry and Linear Relations.md

Grade 9/Math/MPM1DZ/Unit 5: Analytical Geometry and Linear Relations.md

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 ## Slope and Equation of Line   
 - ```Slope```: The measure of the steepness of a line - ```rise / run``` or ```the rate of change```       
-- ```Slope Formula```: $`m = \frac{y_2 - y_1}{x_2 - x_1}`$    
+- ```Slope Formula```: $`m = \dfrac{y_2 - y_1}{x_2 - x_1}`$    
 - ```Standard Form```: $`ax + by + c = 0, a \isin \mathbb{Z}, b \isin \mathbb{Z}, c \isin \mathbb{Z}`$ (must be integers and $`a`$ must be positive)   
 - ```Y-intercept Form```: $`y = mx + b`$    
 - ```Point-slope Form```: $`y_2-y_1 = m(x_2-x_1)`$