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PSYCHO15rus [73]

3 years ago

6

Write an expression to match the words three times the sum of 8 and 4

1 answer:

Eddi Din [679]3 years ago

8 0

3× (8+4)=
...............

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Katyanochek1 [597]

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<h2>x = 1, y = 3 → (1, 3)</h2>

Step-by-step explanation:

$\left\{\begin{array}{ccc}-2x+y=1\\-4x+y=-1&\text{change the signs}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}-2x+y=1\\4x-y=1\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad2x=2\qquad\text{divide both sides by 2}\\.\qquad x=1\\\\\text{Put it to the first equation:}\\\\-2(1)+y=1\\-2+y=1\qquad\text{add 2 to both sides}\\y=3$

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