Write an algebraic equation to represent the situation 3 increased by twice the number of dollars Rhonda made yesterday was 12.

A. 3d+2=12
B.2d×3=12
C.2d+3=12
D.3d×2=12

The cost varies directly with the number of tickets purchased. it costs $145 for 10 people to attend a concert. a. what is the constant of proportionality (k)? b. write the direct variation equation. c. home much does it cost for 8 people? d. graph this situation. be sure to label each axis and give the graph a title.