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The whole process of 8.2 answers in the second volume of seventh grade mathematics published by People's Education Press.
( 1)y=x+3①

7x+5y=9②

Substituting ① into ② gives 7x+5(x+3)=9.

7x+5x+ 15 =9

x=﹣0.5③

Substitute ③ into ① to get y=2.5.

(3) The question is wrong and changed to:

3x+4y=26 ①

5x-6y=33 ②

Multiply by ①×6 to get 18x+24y= 156③.

②×4，20x-24y= 132④。

③+④，x=288/38。

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