Equations in Proportions

Write an equation for the relationship between x and y.

• y = 2x

• y = 1/2x

• y = 2

• y = 1/2

Write an equation for the relationship between x and y.

• y = 2

• y = 1/2

• y = 2x

• y = 1/2x

In the equation y = 14x, what is the constant of proportionality?

• x

• 14

• y

What is the constant of proportionality for this table?

• 8

• 3

• 1/9

• 9

Proportional or Not Proportional?

• Proportional

• Not Proportional

Is this a proportional equation?  Why?

• It is not proportional because it doesn't have a constant.

• It is not proportional because it doesn't have a constant rate of change.

• It is proportional because if x = 0, y = 0.

• It is proportional because it has a y intercept.

Which equation shows a proportional relationship between x and y? (a)  

• y = 3x + 9

• y = 1/2x

• y = 1/2x - 2

• y = x2

Write how to find the proportion of

2:8 :: 25:625

(Do not give space first right the means than the extremes.)

Mathematical Equivalence

ON

Is the given table a proportional relationship? If so, what is the constant of proportionality?

• Yes; X=1/3

• No

• Yes; X=3

• Yes; X=5

What is the constant of proportionality for the table above?

• X=4

• X=3

• X=1/2

• No C.O.P