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umka2103 [35]
3 years ago
11

8+(-3) full work thx If u can help

Mathematics
2 answers:
svet-max [94.6K]3 years ago
7 0
Negative +positive =a negative number
+(-)= -
8+(-3) =8-3
=5
Kisachek [45]3 years ago
5 0

Answer: 5

Step-by-step explanation:

 8+(-3)

=8-3 ⇔ you don't need to change signs when it is positive(+) outside the parenthesis

=5 ⇔ subtraction

#CarryOnLearning

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Answer: Choice B

(-2, 5)

==================================================

Explanation:

The original system is

\begin{cases}-4x+3y = 23\\ x-y = -7\end{cases}

Multiply both sides of the second equation by 3. Doing so leads to this updated system of equations

\begin{cases}-4x+3y = 23\\ 3x-3y = -21\end{cases}

Now add straight down

The x terms add to -4x+3x = -1x = -x

The y terms add to 3y+(-3y) = 0y = 0

The terms on the right hand sides add to 23+(-21) = 2

We end up with the equation  -x = 2 which solves to x = -2

Now use this to find y. You can pick any equation with x,y in it

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-4x+3y = 23

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8+3y = 23

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y = 5

Or

x-y = -7

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y = -5

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