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Seventh-grade mathematics supplementary exercise book 2, page 56, the last question.
Set a big book x yuan and a small book y yuan.

2x+3y=8.7 ①

4x+2y= 12.2 ②

Then: y=6. 1-2x

2x+3(6. 1-2x)=8.7

2x+ 18.3-6x=8.7

18.3-4x=8.7

x=2.4

Bring x=2.4 into ①.

4*2.4+2y= 12.2

y= 1.3

So: x=2.4

y= 1.3

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