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Vesna [10]
3 years ago
11

Solve the simultaneous equations by substitution 4x+3y=-2 3y=4-x

Mathematics
2 answers:
siniylev [52]3 years ago
8 0

Answer:

  • (- 2, 2)

Step-by-step explanation:

<u>Given system:</u>

  • 4x + 3y = -2
  • 3y = 4 - x

<u>Substitute 3y into first equation to get:</u>

  • 4x + 4 - x = - 2
  • 3x = - 2 - 4
  • 3x = - 6
  • x = -2

<u>Now find the value of y:</u>

  • 3y = 4 - (-2)
  • 3y = 6
  • y = 2
stiv31 [10]3 years ago
4 0

Answer: x=-2 y=2

Step-by-step explanation:

I decided that isolating the y value of the second equation is the best way to start solving.

I divide 3 from both sides to get y= (4-x)/3. With this, I can substitute into the first equation. 4x+3(4-x)/3)=-2.

The multiplying the 3 by the denominator three cancels each other out to make:

4x+4-x=-2.

We subtract 4 on both sides and then subtract x from 4x.

We end up with 3x=-6. Then, we divide both sides by 3.

x=-2.

Now we substitute this into the second equation to solve.

3y=4-(-2)

This becomes 3y=4+2 which is 3y=6

We divide both sides by 3 to get y=2

We end up with x=-2 and y=2.

I hope you learned something :)

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puteri [66]

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We will need to use the Pythagorean Theorem here, as we know a and c, but not b. I have attached an image of a triangle sketch to set up the problem, which should hopefully help us to visualize this problem a bit better.

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r-ruslan [8.4K]

Answer:

x = -1, and y = -2, giving you the answer (-1, -2)

Step-by-step explanation:

In the second equation, we're told that y is equal to 2x.  With that, we can replace "y" in the first one with "2x", giving us:

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