Question

Реши систему уравнений {2x−y=7
x−5,5y=14

Answer 1

5y=14
y=14/5
y=2.8

2x-y=7x-5
2x-7x+5=2.8
-5x=2.8-5
5x=2.2
x=2.2/5
x=0.44