Four less than the product of two and a number

In a column proof the right column states your reasons

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.

Point q is located at (−4,6). point r is located at (8, 6). what is the distance from point q to point r?