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Mathematics People's Education Edition Volume II Binary Linear Equations: 3s-t=5 5s+2t= 15.
Solution:

t = 3s-5 5s+2(3s-5)= 15 5s+6s- 10 = 15 1s = 25s = 25/ 1 1t = 75/ 1 1-55/ 1 1t = 20/65438

Test: 75/11-20/1= 55/1= 5125/1+40/.

s = 25/ 1 1t = 20/ 1 1

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