$y = mx + b$

$\frac{\Delta y}{\Delta x} = \text{constant}$

$\text{Area} = \frac{1}{2} b h$

$f'(x) = \lim_{h \to 0} \frac{f(x+h) - f(x)}{h}$

$\int_{a}^{b} f(x)\,dx$