Which equation (s)

represents a proportional

relationship?

A) y = 7x?

B) y = 2 + 3x

C) y = Vzx

D) y = 5 - X

Answer: A) y = 7x

Step-by-step explanation:

In order to be a proportional relationship, the equation MUST pass through the origin (0, 0) and only contain two coordinates

A) 0 = 7 (0) - --> 0 = 0 TRUE

B) 0 = 2 + 3 (0) - --> 0 = 2 False

C) 0 = Vz (0) - --> Too many variables so False

D) 0 = 5 - 0 - --> 0 = 5 False

A, B and D

Step-by-step explanation:

What do you define as proportionality it refers to a relationship; now this relationship is defined as either directly proportional or inversely proportional.

Now take case A; y is directly proportional to X - we say y varies as X varies in a progressive or retrogressive manner. The 7 serves as a constant which comes in handy when ever an equality is been introduced to an item of proportionality.

Also in case B,

As X changes y changes - x is the sole determinant of this y and hence as X increases or decreases y does so likewise.

D; y decreases as X increases and y increases as X decrease; here the relationship of proportionality is converse. When the graph of D is plotted using any testing values we see that the graph cuts the y axis at 5 and the X axis at 5.