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erjalinalii
11.06.2021 •
Mathematics
6 plates and 5 cups cost 23.80 dollars. 7 plates and 6 cups cost 28.00 dollars. Each plate costs the same amount as the other plates, each cup costs the same amount as the other cups. What is the cost of one plate? What is the cost of 1 cup?
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Ответ:
c = $1.4
p = $2.8
Step-by-step explanation:
two equations can be derived from the question
6p + 5c = 23.80 equation 1
7p + 6c = 28 equation 2
p = plates
c - cups
multiply equation 1 by 7 and equation 2 by 6
42p + 35c = 166.60 equation 3
42p + 36c = 168 equation 4
subtract equation 3 from 4
c = 1.4
substitute for c in equation 1
6p + 5(1.4) = 23.80
p = (23.80 - 7) / 6
p = 2.8
Ответ:
4/3
Step-by-step explanation:
Because 6-2 = 4 and 1 - (-2) = 3 b/c a negative and a negative cancel each other out.