Math - Represent a Proportional Relationship

Question

State and justify whether each of the following represent a proportional relationship.

a) y =- 3x²

b)

chart

    x     y

    0     0

    4    -2.5

    8     -5

    12    -7.5

    16    -10

Answer 1

propotional means a linear relation and no constant term, just y=mx. a) is quadratic, not linear, not propotional

change 2 to 1 for the exponent and a) would be proportional

b) y=-2.5x/4 is linear and proportional