Answer + which ordered pair (r, s) is a solution to the given system of equations? a. (1, 8) b. (3, 8) c. (1, –2) d. (8, 3)

Get rid of the 5r by subtracting/adding it to the other side to that it's 7s = -5r + 61 and 7s = 5r -19. equal values says we can due -5r + 61 = 5r - 19. adding 19 to both sides gets -5r + 80 = 5r. adding 5r to both sides gets 80 = 10r, then r=8. if you substitute r=8 into either one of the equations, you should get s=3. so (8,3) 

My guess is  d. (8,3)  or  a. (1,8)

Yes you do, so £1973.09 - £1473.50 = £499.59 so tim overpaid £499.59 .hope this ; )