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2 years ago

2x + 3y = –19 –2x − y = 1

1 answer:

6 0

The x both cancels out

So you’re left with 2y=-18 (add 3y to negative y and -19 and 1)

Divide by 2 and y equals -9

Plug in y to get x

2x + 3(-9) = -19

2x + -27 = -19

Add 27 to both sides

2x= 8

Divide by 2, x= 4

So x= 4 and y = -9

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Write an expression for the perimeter of the triangle shown below:

AveGali [126]

Answer:

The answer is 0.1x-16

Step-by-step explanation:

-3.4x+3x+.5x=0.1x and -25+9 is -16 which is 0.1x-16

6 0

2 years ago

Find the value of k and x2<br> x^2+ 13x + k = 0, x1=-9

Anarel [89]

Given:

The quadratic equation is:

$x^2+13x+k=0$

$x_1=-9$

To find:

The value of k and $x_1$ .

Solution:

We have,

$x^2+13x+k=0$ ...(i)

Putting $x=-9$ , we get

$(-9)^2+13(-9)+k=0$

$81-117+k=0$

$-36+k=0$

$k=36$

Putting $k=36$ in (i), we get

$x^2+13x+36=0$

Splitting the middle term, we get

$x^2+9x+4x+36=0$

$x(x+9)+4(x+9)=0$

$(x+9)(x+4)=0$

$x=-9,-4$

Here, $x_1=-9$ and $x_2=-4$ .

Therefore, the required values are $k=36$ and $x_2=-4$ .

3 0

2 years ago

Find the perimeter of the image below:

Vsevolod [243]

What image hahha hahha

4 0

2 years ago

Read 2 more answers

ANSWER #2 PLEASE :)

dmitriy555 [2]

Since figure t is twice the size of figure s, figure t would be twice the size of s. hence the answer would be a scale factor of 2.

3 0

2 years ago

What’s the value of this expression?<br><br> 6x4-(5+3) dividend by 2

solong [7]

Answer:

Step-by-step explanation:

If you use PEMDAS(Parentheses, Exponents, Multiplication, Division, Addition, Subtraction) you would take care of what's in the parentheses, so you would at 5 and 3 to get 8. Then you would multiply 6 and 4 to get 24, so far your equation looks like this 24 - 8 ÷ 2. You then divide 8 by 2 to get 4 then subtract 24 from 4 to get 20.

8 0

2 years ago