algebra 1
posted by spirit73 .
I still don't understand can someone help me?
the everton college store paid $1553
for an order of 42 calculators. the
store paid $9 for each scientific calculator. the others, all graphing calculators, cost the store $56 each. how many of each trupe of calculator was ordered?
the store ordered:
how many scientfic calculators?
graphing calculators?

how about...
let the number of scientific calculators be x
then the number of graphing calc's is 42x
then 9x + 56(42x) = 1553
9x + 2352  56x = 1553
47x = 799
x = 17
42x = 25
So they bought 17 scientific and 25 graphing types.
check : 17(9) + 25(56) = 1553 
Reiny is mostly correct how I think about it is I think about what I know write it down I see what they are asking me and try to figure it out. Try to make it easier for you to understand