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13.02.2020 •
Mathematics
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Ответ:
B. 20
Step-by-step explanation:
Multiplying the Deominators of both Usually gives you the Common Denominator So 5 x 4 =20
Ответ:
(3,-4)
Step-by-step explanation:
x-2y=5
x-4y+4y=19+4y
x=19+4y
substitue x
-(19+4y)-2y=5
-19-4y-2y=5
-19-6y=5
-6y=5+19
-6y=24
divide by 6 in both sides
y=-4
find Y now
x=19+4(-4)
x=19-16
x=3
(3,-4)