- The title of the formula is based on what you have given in the problem.
- Slope/Intercept Formula (You have the slope and an intercept): $$y = mx + b$$
- Slope/Point Formula (You have the slope and a point): $$y - y1 = m(x - x1)$$
- If you've been given two points you can find the slope with the slope formula: $$m = \frac{y2 - y1}{x2 - x1}$$
- Pythagorean Theorem: $$a^2+b^2=c^2$$. Used to find the hypotenuse (long side not connected to the right angle) of a triangle.
- Distance Formula: $$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$$
- Midpoint Formula: $$M=(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2})$$