sjkehildu
17.03.2020 •
Mathematics
What is the solution of the system equations x + 2y = 1 and 2x -y = 7
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Ответ:
x + 2y = 1
x = 1 - 2y
2x - y = 7
2(1 - 2y) - y = 7
2 - 4y - y = 7
-5y = 9
y = -9/5
x = 1 - 2y
x = 1 - 2(-9/5)
x = 1 + (18/5)
x = 23/5
Ответ:
2 hours per day
Step-by-step explanation:
19.5 - 5.5 = 14
14 / 7 = 2 hours per day