5. Use the Method of Elimination to find the equation of the line, in y=mx+b form, that passes through each set of points. Set up a system first, like we did Exercises #3 and 4 from the lesson. Then, solve the system for the slope, m, and the y-intercept, b. (a) (3,10) and (5,18) (b) (-2,5) and (6,-7) 6. Lilly and Rosie are sisters. The sum of their ages is 19 and the positive difference of their ages is 9. Set up a system of equations involving Lilly's age, L, and Rosie's age, R, assuming that Lilly is the older child. Solve the system to find their ages. 7. Shana bought sodas and popcorn for the movies. Sodas cost $3 each and popcorn costs $4 per bag. Shana bought 7 things from the concession, all either sodas or bags of popcorn. Shana spent a total of $26. Write a system of equations involving the number of sodas, s, and the bags of popcorn, b. Solve the system to see how many of each Shana bought.