Need help will mark brainliest thank you

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?