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Basile [38]
2 years ago
12

(07.01) What is the value of y in the equation y-7 = 21? (4 points)

Mathematics
2 answers:
TEA [102]2 years ago
6 0

Answer:

y=28

Step-by-step explanation:

Hope this helps

Lyrx [107]2 years ago
3 0

Answer:

y=28

Step-by-step explanation:

y-7+21

+7  +7

0     28

so y=28

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2 years ago
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(x-a)^2+(y-b)^2=r^2\\\\(a;\ b)-the\ coordinates\ of\ the\ center\\r-the\ radius\\\\==================================\\Use:(k+l)^2=k^2+2kl+l^2\ (*)\\==================================

x^2+y^2+14x+10y=7\\\\x^2+14x+y^2+10y=7\\\\x^2+2x\cdot7+y^2+2y\cdot5=7\\\\\underbrace{x^2+2x\cdot7+7^2}_{Use\ (*)}-7^2+\underbrace{y^2+2y\cdot5+5^2}_{Use\ (*)}-5^2=7\\\\(x+7)^2-49+(y+5)^2-25=7\\\\(x+7)^2+(y+5)^2-74=7\ \ \ \ |add\ 74\ to\both\ sides\\\\(x+7)^2+(y+5)^2=81\\\\(x+7)^2+(y+5)^2=9^2

Answer:\\\boxed{(-7;-5)-center;\ 9-radius}
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3 years ago
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