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aleksandr82 [10.1K]
3 years ago
12

Trevor solved the system of equations below. What mistake did he make in his work?

Mathematics
1 answer:
storchak [24]3 years ago
3 0
The answer is <span>He subtracted 10 from the right side instead of adding 10 to the right side

Let's solve it:
</span><span>2x + y = 5
x − 2y = 10
________
Rearrange first equation to get y:
y = 5 - 2x
________
Substitute y into the second equation:
x - 2(5 - 2x) = 10
________
Multiply the terms:
x - 10 + 4x = 10
________
Combine the terms:
5x - 10 = 10
________
Add 10 on the both sides of the equation:
5x = 10 + 10
5x = 20
x = 4</span>
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.. (-3/2)² = 9/4 . . . . . . the number you need to add.

x² -3x +9/4 = (x -3/2)²

_____
If the x² term has a coefficient other than 1, you need to factor that out first and deal with the remaining binomial. For example,
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For this you would need to add 9/4 inside parentheses to get
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Of course, to keep the original value, you would need to subtract 2*(9/4) outside parentheses.
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3 years ago
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vekshin1

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(Download Photomath)

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3 years ago
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3 years ago
Find the length of side x in simplest radical form with a rational denominator
Angelina_Jolie [31]

Answer:

The length of x=3/1

Step-by-step explanation:

Given the right triangle

Ф = 30

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sin Ф = opposite/hypotenuse

The opposite of angle 30° = x

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so

sin 30 = opposite/hypotenuse

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Therefore, the length of x=3/1

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3 years ago
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