22. Pat bought 45 stamps, some for 10c and some for 18c. If he spent $6.66 altogether, how many 10c stamps did he buy?
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Step-by-step explanation:
x = number of 10 cent stamps
y = number of 18 cent stamps
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x + y = 45
10x + 18y = 666
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put the system of linear equations into standard form
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x + y = 45
10x + 18y = 666
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