Asoccer coach purchased one goal and some soccer balls for the team. the expression 180 + 15x represents the cost before tax. what do the different parts of the expression model? drag the parts of the expression into the boxes to match each description.

The expression consists of ONE CONSTANT [180] and another VARIABLE EXPRESSION [15x].

Since the coach purchased ONE GOAL, this corresponds to the CONSTANT, which is 180. 180 is the price of the goal.

Since coach purchased several soccer balls, but doesn't say how many, it is the variable part, 15x, where

180 represents the price of the goal

15x represents the total price of the soccer balls

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