# algebra 1

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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 -

Let
S = number of scientific calculators

"an order of 42 calculators."
42-S = number of graphing calculators.

"the store paid \$9 for each scientific calculator... graphing calculators, cost the store \$56 each"

Total cost
= \$9*S + \$56*(42-S)
Since the total cost is \$1553, solve for S in
\$1553 = \$9*S + \$56*(42-S)

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