Lecture 2

Question 1

how can you prove that a graph is a function?

Answer 1

using the verticle line test

Question 2

how can you tell if a function is increasing?

Answer 2

if the y values increase as the x values increase

Question 3

how can you tell if a function is decreasing?

Answer 3

if the y values decrease as the x values increase

Question 4

how can you tell if two variables are proportional?

Answer 4

if they are both on the numerator on either side of the equation

Question 5

how can you tell if two variables or inversely proportional?

Answer 5

if one variable is in the numerator and the other is in the denominator on either side of the equation

Question 6

how can you prove that a graph is invertible?

Answer 6

using the horizontal line test