Question 85217
Quote #1: four 17”-monitors and six 19”-monitors for $2300
Quote #2: six 17”-monitors and four 19”-monitors for $2200 
What are the prices for a single 17”-monitor and a single 19”-monitor?
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Let cost of a 17" monitor be s
Let cost of a 19" monitor be n
EQUATION:
4s + 6n = 2300
6s + 4n = 2200
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Multiply 1st by 3 to get:
12s + 18n = 6900
Multiply 2nd by 2 to get:
12s + 8n = 4400
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Subtract one from the other to get:
10n = 1500
n = $150 (price of a 19" monitor)
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Substitute in 4s+6n = 2300 to solve for s:
4s + 6*150 = 2300
4s = 2300 - 900
4s = 1400
s = $350 (price of a 17" monitor)
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Cheers,
Stan H.