catherinesquitieri
18.08.2021 •
Mathematics
Which of the following statements are true?
Select all that apply.
A. 27 is a perfect cube.
OB. 121 is a perfect square.
C. 9 is a perfect cube.
D. 21 is neither a perfect square nor a perfect cube.
OE. 2,197 is both a perfect square and a perfect cube.
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Ответ:
x = 2 1/4 y = -1/2
Step-by-step explanation:
y= - 1/2
y=2x-5
Substitute y = -1/2 into the second equation
-1/2=2x-5
Add 5 to each side
5-1/2 = 2x-5+5
4 1/2 = 2x
Multiply each side by 1/2 to isolate x
9/2 *1/2 = 2x * 1/2
9/4 = x
Change to a mixed number
2 1/4 =x