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4 years ago

3x + 4y = 2 2x + 4y =8

1 answer:

5 0

We see that both equations have 4y in them. Subtracting the second equation from the first equation, we get (3x -2x) + (4y-4y) = 2 - 8, x = -6

Plugging x = -6 into any equation, we see that our answer is 18 + 4y = 2, 4y = 2 - 18 = -16, y = -4.

Our answer is x = -6, y = -4

You might be interested in

Compare the strengths and weaknesses of the horizontal and vertical methods for adding and subtracting polynomials. Include comm

Pavlova-9 [17]

Answer:

Overall vertical is visually better, if done correctly

it forces you to "line up" all the common exponents.

The disadvantage is that it usually requires re-writing the problem, and it takes up space.

most problems are presented horizontally, that becomes the issue to locate the common exponents.

in both cases the biggest issue is people forget

that when subtracting "subtracting a negative is like adding a positive"

-5x - (-8x) = 3x [that is a positive 3x]

or:

-7x

- - 10x

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

everyone misses those eventually so you have to watch out for that in both methods

Step-by-step explanation:

5 0

3 years ago

For which value of x is the equation 3(3 + x) = 15 + x true?

seraphim [82]

Answer:

x=3

Step-by-step explanation:

3(3 + x)=15+x

distribute

9 + 3x= 15+x

subtract x from each side

9+3x-x = 15

9+2x = 15

subtract 9 from each side

9+2x-9 = 15-9

2x = 6

divide by 2

2x/2 = 6/2

x=3

7 0

3 years ago

Read 2 more answers

Whoever answers first and gets the problem correct, I will mark brainliest

hodyreva [135]

Fill in the given information:
-3 = p/(-12)
Multiply by -12.
(-3)(-12) = p = 36

The appropriate choice is ...
D. 36

6 0

3 years ago

Re-write the quadratic function below in Standard Form y=-3 (x - 2)² – 7

pav-90 [236]

Answer:

$y=-3x^2+12x-19$

Step-by-step explanation:

we know that

The quadratic equation in standard form is equal to

$y=ax^{2} +bx+c$

we have

$y=-3(x-2)^{2}-7$

This is a quadratic equation in vertex form

Convert to standard form

$y=-3(x^2-4x+4)-7$

Apply distributive property

$y=-3x^2+12x-12-7$

Combine like terms

$y=-3x^2+12x-19$ ----> quadratic equation in standard form

3 0

3 years ago

Please answer this correctly I want helping hand people to answer this

kotykmax [81]

Answer:

Step-by-step explanation:

Take 4 times 2.5 since 25 / 10 = 2.5

4 x 2.5 = 10

6 0

3 years ago

Read 2 more answers