noorainhussain17 noorainhussain17
  • 26-03-2020
  • Mathematics
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How much does the book cost?

Use algebra to write two equations to show the info Joey can remember!

How much does the book cost Use algebra to write two equations to show the info Joey can remember class=

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SphereDeer
SphereDeer SphereDeer
  • 26-03-2020
okay so the two equations are (b-book d-dvd)
d-4=b
and 3d+b=28

so to solve this if we know that a dvd costs £4 more than a book and we have 3 of them then if we take 3 lots of 4 away from the 28 then we will have an amount equal to 4 books
so 28-12=14
14/4= £3.50
if 1 book is £3.50 then a dvd is £7.50 as it is £4 more
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