# Equation of a Line, Tangent Lines

On this page we hope to demonstrate the following:

Equation of a Line, standard form and point-slope

Ex: y = 3x + 4, y - 7 = 3(x - 1)

Finding x-intercept and y-intercept

Finding the equation of tangent lines

Ex: Find the equation of the tangent line of y = x^{3} at x = 2

### Equation of a line

**Standard Form**

When we try to graph polynomials, we quickly find that a polynomial of single degree, where nothing is squared or square-rooted, is always going to be a line. Let's analyze the line y = 3x + 4, whose equation is written in standard form.