Formula for a line:

`y = mx + b`

Slope of a line:

`m = (Delta y)/(Delta x) = (y_2 - y_1)/(x_2 - x_1)`

Y-intercept:

• Y-intercept - where the line intersects with the line defined by the Y-axis

`y = mx + b`
`y = m(0) + b`
`y = 0 + b`
`y = b`

Pythagorean theorem:

`c^2 = a^2 + b^2` or `c = sqrt(a^2 + b^2)`