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oksano4ka [1.4K]
2 years ago
12

Help me find x it’s really hard

Mathematics
1 answer:
Vilka [71]2 years ago
3 0

Answer:

x = 140

Step-by-step explanation:

180 - 65 - 75= 40

180 - 40 = x

140 = x

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4x + 12 = -7y<br> -y + 12 = 4x<br> Solve with elimination
statuscvo [17]
Take the second equation and flip it around so the y on the left ends up on the right and the 4x on the right ends up on the left.  This makes all negatives positive and all positives negative.   -4x   + 12  = y 

Then add the first equation to the second equation 
4x   +12   = -7y
<u>-4x   + 12  </u>=<u> y </u>   this eliminates the x's
          <u>24</u> = -<u> 6y</u>            then divide by - 6
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</u>So if you know that y = negative 4, you can substitute into either equation.  I pick the second one because I am a lazy person.  
  -y  + 12  = 4 x
-(-4) + 12 = 4 x     combine your numbers<u>
</u>   <u>  16     </u> = <u>4 x  </u>      then divide by 4<u>
</u>       4      =  x
So your solution is: x = 4 and y = -4 or this is also written (4, -4)

Does that work for you?
4 0
3 years ago
Read 2 more answers
Please help me!! So confused? what's the answer??!!!
iris [78.8K]

Answer:

V = 113.04

Step-by-step explanation:

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Step-by-step explanation:

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