Mary palm's checking account had a starting balance of $785.63. she wrote a check for $57.00 for groceries and a check for $125.00 for a car payment. yesterday she deposited $57.25 in her checking account. what is mary's current balance?

a. $603.63
b. $660.88
c. $554.26
d. $796.38

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