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jeyben [28]
3 years ago
11

If 8x−4y=20 and 4x−8y=4, what is the value of x−y?

Mathematics
1 answer:
____ [38]3 years ago
5 0

Answer:

Step-by-step explanation:

Solve the system:

8x−4y=20

4x−8y=4

Reduce the first equation by dividing every term by -2:

-4x + 2y = -10

and then combine this result with the second equation:

4x−8y=4

-4x + 2y = -10

--------------------

      -6y = -6, and so y = 1.  

According to the first equation, if y = 1, then 4x - 8 = 4, or x = 3.

Then x = 3 and y = 1.

So, finally, x - y = 3 - 1 = 2

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What is 2x + 3(x - 1) simplified?
maxonik [38]

Answer:

5x-3

Step-by-step explanation:

2x+3(x)+3(-1)= 2x+3x-3

5x-3

8 0
3 years ago
Help please ASAP<br> thanks!
ludmilkaskok [199]
A. 55%
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7 0
3 years ago
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Evaluate BC for A = 5, B = 4, and C = 2.<br> 06
VARVARA [1.3K]

Answer:Its 8.24

Step-by-step explanation:

4 times 2.06 is 8.24 :}

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3 years ago
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I really need someone to answer this, QUICK!
Elodia [21]

Answer:

A. LCM=72   B. GCF=7    C. 7(5+9)

Step-by-step explanation:

A. 8/2=4/2=2  9/3=3   Use the denominators to find the LCM. In this case, the LCM is 72.

B.  35/5=7   63/3=21/3=7    The GCF for these numbers is 7 because it is the only factor that they have in common.

C.   7 x 14=88     Since 5 and 9 don't have common factors, they work perfectly for this problem.

6 0
3 years ago
Solve for x and then part b) find JL. Have no clue how to go about this
Igoryamba

9514 1404 393

Answer:

  • x = 4
  • JL = 16

Step-by-step explanation:

a) You go about this by using the given equation.

  Left + Right = Total

  JK + KL = JL

  (2x -3) + 11 = 4x

  8 = 2x . . . . . simplify, subtract 2x

  4 = x . . . . . . divide by 2

__

b) JL = 4x = 4·4

  JL = 16

8 0
2 years ago
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