Proportional Graph Equations

Which graph is proportional?

• A

• B

• C and D

• All of the graphs are proportional

A proportional relationship can be written as an equation in the form:

• y = k+x

• y = k-x

• y = kx

• y = k/x

y=kx.  What does the k represent?

• constant of proportionality

• multiplier

• scale factor

• all of these are correct

Determine the constant of proportionality.

• 5

• 0.2

• 1

• 1.4

Graph the equation

y=3/5x

Graph the equation

y=3x

A snail moving at a constant rate traveled a distance of 2 feet in 1/2 hour. Create a graph to represent y, the number of feet the snail traveled in x hours. Select two points on the coordinate grid that represent the situation.

The cost of five pounds of grapefruit is $6.00. The cost per pound of grapefruit remains the same regardless of the quantity purchased. Graph the relationship between y, the total cost of grapefruit purchased, and x, the weight in pounds of the grapefruit purchased.Plot two points on the coordinate grid.