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Anika [276]
3 years ago
7

This is all I know what to do any help?

Mathematics
1 answer:
svetoff [14.1K]3 years ago
4 0
You can multiply the second equation by -2 

-5x + y = 15         everything by -2

10x - 2y = -30

now you can solve them

2x + 2y = -6
10x - 2y = -30

y cancels

2x= -6
10x = -30


12x = -36
/12.     /12

x = -3 


now to solve for y you substitute x for -3

-5(-3) + y = 15
15 + y = 15 
-15        -15

       y= 0
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3 years ago
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Yakvenalex [24]

Answer:

The answer is 162.

Step-by-step explanation:

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3 years ago
Solve -2/3x > 8 or -2/3x < 4.
vekshin1
<h3>Answer: Choice C</h3>

{x | x < -12 or x > -6}

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

Explanation:

Let's solve the first inequality for x.

(-2/3)x > 8

-2x > 8*3

-2x > 24

x < 24/(-2)

x < -12

The inequality sign flips when we divide both sides by a negative value.

Let's do the same for the second inequality.

(-2/3)x < 4

-2x < 4*3

-2x < 12

x > 12/(-2)

x > -6

The conclusion of each section is that x < -12 or x > -6 which points us to <u>choice C</u> as the final answer.

Side note: The intervals x < -12 and x > -6 do not overlap in any way. There's a gap between the two pieces. We consider these intervals to be disjoint. The number line graph is below.

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56.5

Step-by-step explanation:

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