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Anettt [7]
3 years ago
8

In order to solve the following system of equations by subtraction, which of

Mathematics
1 answer:
uysha [10]3 years ago
7 0

Answer: I think it's C.Multiply the top equation by 3 and the bottom equation by 4

Step-by-step explanation:

Multiplying the top equation by 3 you get:

3(4x – 2y) = 3∗7

12x - 6y = 21          (eq.1)

Multiplying the bottom equation by 4 you get:

4(3x – 3y) = 4∗15

12x - 12y = 60       (eq.2)

Now, if you subtact eq.2 from eq.1 you get:

(12x - 6y = 21 )

-

(12x - 12y = 60)

___________________

0x + [- 6y -(-12y)] = 21 - 60

Carrying out the calculation you get:

6y = -39

y = -39/6

y = -13/2

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What is the solution to the inequality in interval notation? |4x+6|≤14
alexandr1967 [171]

Answer: x>5

Step-by-step explanation: The Absolute Value term is |4x+6|

For the Negative case, we'll use -(4x+6)

For the Positive case, we'll use (4x+6)

-(4x+6) = 14

    Multiply

     -4x-6 = 14

    Rearrange and Add up

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    Rearrange and Add up

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9 &lt; 4(x+9) -7 - 25<br> Solve , intervals, and graph
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9<4(x+9)−7−25

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Step 4: Divide both sides by 4.

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