-8Q+6+30-1
Help plz and please explain how

This is just an expression. It's not an equation, so there's nothing to solve for.

The only thing you can do here is add like terms:

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