Mandy used the graph to write the equation of the line it represents. She took these steps. 1.   y−intercept = (0, 2)

2.   Slope =
rise
run
=
− 2
4
= −
1
2

3. Substituting values into y = mx + b

You can find the constant of proportionality by finding the ratio of

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=

Sample response: if the graph passes the horizontaline test, then the function is one to one. functions that are one to one have inverses that a therefore, the inverse is a hinction compare your response to the sample response above. what did you include in your explanation? a reference to the horizontal-line test d a statement that the function is one-to-one the conclusion that the inverse is a function done