Tim has $250 in his account. This is $75 more than his brother Nate has in his account. Write and solve an addition equation to find the amount of money in Nate’s account.

he answer is x=1x3 because x=1 to x=3

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