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andriy [413]
3 years ago
13

3x+2y=-4 y= 4x-2 use substitution

Mathematics
2 answers:
Grace [21]3 years ago
4 0
(X,Y) = (0,-2)
Substitute the given value of y and x into the equation and simplify
lawyer [7]3 years ago
4 0

Answer: x = 0 and y = -2

Step-by-step explanation:

3x+2y=-4  ............................. equation 1

y=4x-2  ............................... equation 2

Using substitution method

substitute y=4x-2 into equation 1 , equation 1 then becomes

3x + 2(4x-2) = -4

3x+8x-4 = -4

11x-4=-4

add 4 to both sides

11x = 0

therefore:

x = 0

substitute x = 0 into equation 2 to find the value of y

y = 4x - 2

y = 4(0) - 2

y = -2

therefore:

x = 0 and y = -2

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3 years ago
Which section of the function is decreasing? (4 points)
vredina [299]

Answer:

Step-by-step explanation:

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8 0
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PLS HELP IM FAILING MATH!
oksano4ka [1.4K]

Answer:

1. Never true

2. Never true

3. Bad question!  Typo? (see discussion below)

4. Always true

5. Always false

Step-by-step explanation:

1. x - 13 = x + 1.  Subtract  x  from both sides of the equation, and you get -13 = 1.  False!  (Never true!)

2.  x + 1/2 = x - 1/2.  Subtract x from both sides:  1/2 = - 1/2.  False! (Never true!)

3. This one's weird, with two equal signs.  That's not unusual; multiple equal signs are often used when a chain of equalities is being displayed.  For instance, you can write  (3)(2x + 5) = (3)(2x) + (3)(5) = 6x + 15.  That's an example of the Distributive Property--the 3 is multiplied by both of the terms inside parentheses (shown after the first equal sign), then actually doing those multiplications produces the expression after the second equal sign.

OK!  This question says 2(x + 3) = 5x = 6 - 3x.  Take it in two parts.

a. 2(x + 3) = 5x   Distribute the 2.

2x + 6 = 5x   Now subtract 2x from both sides.

6 = 3x   Divide both sides by 3.

2 = x  So that first part is true only when x = 2.  Gaa!  That's not one of your answer choices.  Now, check out the second part

b.  5x = 6 - 3x  Add 3x to both sides.

8x = 6   Divide by 8

x = 6/8 = 3/4

It doesn't help to use the first and <u>third</u> expressions, either.

2(x + 3) = 6 - 3x   Distribute the 2

2x + 6 = 6 - 3x  Add 3x.

5x + 6 = 6   Subtract 6.

5x = 0   Divide by 5

x = 0

None of these is always false.  None of these is always true.

4.  x - 3 = 2x - 3 - x   Simplify the right side by combining the x terms.

x - 3 = x - 3  Aha!  Same expression on both sides!  Always true

5.  3(x - 5) = 2(x - 5) + x  Distribute the 3. Distribute the 2.

3x - 15 = 2x - 10 + x  Combine the x terms on the right.

3x - 15 = 3x - 10  Subtract 3x

-15 = -10  (Always false!)

7 0
2 years ago
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pantera1 [17]

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Step-by-step explanation:

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Gnesinka [82]
Sent a picture of the solution to the problem (s).

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