All you have to do is add -6-9 which equals -25 because “same signs add(+) and keep” “different signs subtract(-)” but “add” means positive number and “subtract” means negative number. Since they are different signs a (+) and a (-) you subtract it.
234 = a + s s = students a = adults 2a = s after you get the equations you solve. plug 2a into the above equation. so u get 234 = a + 2a 234=3a then divide 3 from each side 78 = a so 78 adult tickets were sold
