Since 1990, When the Average Monthly Price for Basic Cable $C = - 15.81 t + 1.12$

Multiple Choice

Since 1990, when the average monthly price for basic cable TV programming in one country was $15.81, the cost has risen by about $1.12 a year. Write an equation in slope-intercept form to predict cable TV costs in the future. Use t to represent time in years after 1990 and C to represent the average basic monthly cost.

A) $C = - 15.81 t + 1.12$
B) $C = 1.12 t + 15.81$
C) $C = 15.81 t - 1.12$
D) $C = - 1.12 t + 15.81$
E) $C = 1.12 t - 15.81$