What are the values of a and b, so the solution of the linear system is (5,2)?

ax + by =23 Equation 1
ax - by =7 Equation 2

Acircular garden with radius of 8 feet is surrounded by a circular path with a width of 3 feet. what is the approximate area of the path alone? use 3.14 for π

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?

Me get the answer and explain to me the steps to solve it would be greatly appreciated : )