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Leto [7]
3 years ago
9

Solve, using linear combination. 11x + 4y = 18 3x + 4y = 2

Mathematics
2 answers:
antoniya [11.8K]3 years ago
8 0
11x + 4y = 18
3x + 4y = 2.....multiply by -1
----------------
11x + 4y = 18
-3x - 4y = -2 (result of multiplying by -1)
---------------add
8x = 16
x = 16/8
x = 2

3x + 4y = 2
3(2) + 4y = 2
6 + 4y = 2
4y = 2 - 6
4y = -4
y = -4/4
y = -1

solution is : (2,-1)
tensa zangetsu [6.8K]3 years ago
4 0
11 x + 4 y = 18
3 x + 4 y = 2 

11 x + 4 y = 18 
- 3 x - 4 y = - 2 

8 x = 16 
x = 2 

11 x + 4 y = 18
22 + 4 y = 18
4 y = 18 - 22 
4 y = - 4 
y = - 1 

S ( - 1 ; 2) 

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Ratio to percent 16:25
Tamiku [17]
<h3>Solution:</h3>

By multiplying it by 100, we can get the answer.

<h3>Given Ratio:</h3>

\huge \purple {\tt {16:25}}

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\huge \pink {\tt { \frac{16}{25}  \times 100}}

\huge \red {\tt {= 16 \times 4}}

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8 0
3 years ago
Read 2 more answers
A line passes through the point (9,3) and is parallel to the line with the equation y=5x+5
Softa [21]

Answer:

perpendicular to a given line passing through a specific point. ... solve for y: The slope of the line 3x – 5y = 9 is m = 3/5. ... Using the slope of 3/5 and the y-intercept of 43/5, the answer is: ...

7 0
3 years ago
Can someone check questions?
Soloha48 [4]
1
The first one is correct. 

2
A hexagon has the weird property of having the radius and the side being of exactly the same length

The formula is A = 3 * sqrt(3) * a^2 / 2
where a = the side  or radius
A = 3 * sqrt(3) * 5^2 / 2
A = 3 * sqrt(3) * 25 / 2
A = 1.5 * sqrt(3) * 25
A = 64.95

A <<<< Answer (the first one is the answer.) 


C
This one seems so much more entailed. Do you know what the cos law is? That's what I will use to find c.

c^2 = a^2 + b^2 - 2*ab* cos(C)
C = 33 degrees
a = 2.75 miles
b = 1.32 miles

c^2 = 2.75^2 + 1.32^2 - 2 * 2.75 * 1.32 * cos(33)
c^2 = 9.3049 - 6.0887
c^2 = 3.2162
c = sqrt(3.2162) = 1.7934 

Now you have to use this result to get the area. You have to use Heron's formula.

A = sqrt(s * (s - a) * (s - b) * (s - c) )
s = 1/2 the perimeter
s = 1/2 (2.75 + 1.32 + 1.7934)
s = 1/2(5.8634)
s = 2.9317
I'll finish this in the comments. I have to leave for a bit.

6 0
4 years ago
6=-3(x+2) I have to combine and do something but I just dont understand it ​
denis23 [38]
6=-3(x+2)
——Distribute -3(x+2)

6=-3x-6
—-Flip the equation

-3x-6=6
—-add 6 on both sides..the 6’s will cancel each other and 6+6=12

-3x=12
—-divide -3 on both sides..the 3’s will cancel each other and 12 divided by -3 = -4

Answer: x = -4
4 0
3 years ago
Yeah I know pretty easy I’m just lost so can anyone help put
alekssr [168]

Options A,C,D and E are the correct answers

5 0
3 years ago
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