Seventy concert tickets are sold for 550$.Each adult ticket cost 9$ and each children’s ticket cost 5$.Find the number of adult tickets and the number of children’s tickets sold
# adult = x Amount from adult tix = 9x
# children = 70 - x Amount = 5 (70-x)
added together , the amounts sum to $550
9x + 5(70-x) = 550 solve for 'x' the number of adult tix, then #child tix = 70 -x