Dev keeps a record in graph form of how far his car travels and the
number of gallons of gasoline it
uses.
Driving Distance
320
256
Miles
192
128
64
16
12
Gallons of gasoline
What is the rate of change of the graph?
O 32 miles/gallon
O 1/32 gallons/mile
O 64 miles/gallon
• 1/64 gallons/mile

step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.