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3 years ago

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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