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zaharov [31]
3 years ago
8

HOW DO I DO NUMBER 7?!?? WHATS THE ANSWER?!?!??????

Mathematics
1 answer:
hichkok12 [17]3 years ago
5 0
Simple actually. The 1000 is the starting price the -20 is the losing of value per week and the w stands for the number of weeks.
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Kara and Sonny went to see a movie at the local theater.
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Answer:

popcorn=4$

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Step-by-step explanation:

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1-we multiply (p+s=8.5) by (-2) so we could get rid of (s) and be leftover with (p)

so: (-2p-2s= -17)

2- we subtract this equation from (p+2s=13) and the result will be (-p= -4)

3- divide them by (-1) and the result is (p=4)

4-(p+s=8.5) ,substitute (p) with (4) and make it go to the other side with negative sign and the result of (s) is (8.5-4=4.5)

  • if we used substituting method:

1-(p+s=8.50), we will make (s) go to the other side with negative sign so the result is (p=8.50-s)

2-(p+2s=13.00), substitute (p) with (8.50-s):

(8.50-s+2s=13)

3- make (8.50) go to the other side with negative sign:

(s=13-8.50=4.5) and then you could get (p)

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vodomira [7]

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Step-by-step explanation:

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