B: 4-5&1/2

Need helppp I forgot how to do these, four minus five and a half

i think it's b

step-by-step explanation:

because the graph is 2 above (0,0)

is should be y = 5x

step-by-step explanation:

correct me if im wrong

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x