Let the number of matinee tickets they bought be t, the number of drinks bought be d and the number of popcorn bags bought be p, then the amount the spend on the number of drinks and bags of popcorn they bought is given by 
.
The coefficients in the expression are 5.5 and 6 while the constant is 13 and the variables are d and p.
The coefficients in the expression are 5.5 and 6 while the constant is 13 and the variables are d and p.
