1. "Since the mathematicians have invaded the theory of relativity, I do not understand it myself any more." -- Albert Einstein

2. Linear Equations and Intercepts Section 3.3

3. Overview Recognizing Linear Equations Intercepts Using Intercepts for Graphs Graphing Horizontal or Vertical Lines

4. Recognizing Linear Equations Standard form

5. Intercepts y-intercept x-intercept

6. Using Intercepts for Graphs Finding x and y intercepts (p. 188) – To find y-intercept of an equation’s graph, replace x with 0 and solve for y – To find x-intercept of an equation’s graph, replace y with 0 and solve for x

7. Graphing Horizontal or Vertical Lines Standard Form – Ax + By = C What if A or B (but not both) were 0? – If A = 0, then there is no x-term and the graph is a horizontal line – If B = 0, then there is no y-term and the graph is a vertical line

8. Graphing Horizontal or Vertical Lines Linear equations in one variable (p. 192) – Graph of y = b is a horizontal line With y-intercept (0, b) – Graph of x = a is a vertical line With x-intercept (a, 0)

9. 1 3 2 4 5 -3 -2 -4 -5 -3-2-4-513245 x y