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3 years ago

10

Julian’s brother is performing some calculations on his calculator. Julian sees that the result in the display is 4.13E7. How ca

n this number be expressed in standard notation?

1 answer:

ElenaW [278]3 years ago

8 0

I think it would be 413*10^5

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Rufina [12.5K]

Answer:

$x=33\\y=-41$

Step-by-step explanation:

Let:

$2x+y=25\hspace{5}(1)\\and\\4x+3y=9\hspace{5}(2)$

We need to eliminate one of the variables, so let's use elimination method. First multiply (1) by 2

$2*(1)\equiv\hspace{5}4x+2y=50$

Now subtract (2) from 2*(1) in order to eliminate x:

$2*(1)-(2)\\4x-4x+2y-3y=50-9\\-y=41$

Solving for y:

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Finally, replacing the value of y in (1)

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Solving for x:

add 41 to both sides:

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Multiply both sides by 1/2:

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