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2 years ago

7

Please help, type your answers in order .

1 answer:

Nataly_w [17]2 years ago

8 0

Answer:

what is the change in tomorrow morning but will be there at about human variation

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miss Akunina [59]

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Just replace x as 3 and then solve as usual :)

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3 years ago

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3 years ago

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Harlamova29_29 [7]

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3 years ago

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Pavlova-9 [17]

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3 years ago

Solve the system of linear equations by elimination 2x+7y=1 2x-4y=12

pishuonlain [190]

$\left\{\begin{array}{ccc}2x+7y=1\\2x-4y=12&\text{change the signs}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}2x+7y=1\\-2x+4y=-12\end{array}\right}\qquad\text{add both sides of equations}\\.\qquad\qquad11y=-11\qquad\text{divide both sides by 11}\\.\qquad\qquad \boxed{y=-1}\\\\\text{Put the value of y to the first equation:}\\\\2x+7(-1)=1\\2x-7=1\qquad\text{add 7 to both sides}\\2x=8\qquad\text{divide both sides by 2}\\\boxed{x=4}\\\\Answer:\ \boxed{x=4\ and\ y=-1\to(4,\ -1)}$

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4 years ago