Homework Help: algebra 1

Posted by spirit73 on Tuesday, September 29, 2009 at 8:51am.

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?

algebra 1 - Reiny, Tuesday, September 29, 2009 at 9:08am
how about...

let the number of scientific calculators be x
then the number of graphing calc's is 42-x

then 9x + 56(42-x) = 1553
9x + 2352 - 56x = 1553
-47x = -799
x = 17
42-x = 25

So they bought 17 scientific and 25 graphing types.

check : 17(9) + 25(56) = 1553

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