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SOVA2 [1]
3 years ago
13

Solve system by elimination -16x-9y=20 8x+2y=0

Mathematics
1 answer:
sladkih [1.3K]3 years ago
5 0
\left \{ {{-16x-9y=20} \atop {8x+2y=0\ \ | *2}} \right. \\\\  \left \{ {{-16x-9y=20} \atop {16x+4y=0}} \right. \\+------\\\\
-5y=20\ \ \ | divide\ by\ -5\\\\
y=-4\\\\
16x=-4y\ \ \ | divide\ by\ 16\\\\
x=-\frac{1}{4}y=-\frac{1}{4}*(-4)=1
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The mass of the particles that a river can transport is proportional to the sixth power of the speed of the river. A certain riv
katrin2010 [14]

Answer:

7.25

Step-by-step explanation:

200m/s^6 = m/3^6

s^6 = 200*3^6

s = 3*200^(1/6) = 7.25 mi/hr

Hope I helped!


8 0
4 years ago
Factored 8x2y3-5= <br> I need the answer
ANTONII [103]

Answer: Reformatting the input :

Changes made to your input should not affect the solution:

(1): "y3" was replaced by "y^3". 1 more similar replacement(s).

STEP

1

:

Equation at the end of step 1

(23x2 • y3) - 5

STEP

2

:

Trying to factor as a Difference of Cubes

2.1 Factoring: 8x2y3-5

Theory : A difference of two perfect cubes, a3 - b3 can be factored into

(a-b) • (a2 +ab +b2)

Proof : (a-b)•(a2+ab+b2) =

a3+a2b+ab2-ba2-b2a-b3 =

a3+(a2b-ba2)+(ab2-b2a)-b3 =

a3+0+0+b3 =

a3+b3

Check : 8 is the cube of 2

Check : 5 is not a cube !!

Ruling : Binomial can not be factored as the difference of two perfect cubes

Final result :

8x2y3 - 5

5 0
3 years ago
I need answer how to do
dolphi86 [110]
For number 3 the problem solving it can be What is the difference between the T REX and the triceratops

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6 0
3 years ago
Read 2 more answers
In to see the<br><br> 2x+y=20<br><br> 6x 5y = 12
Andre45 [30]

Answer:

1: x = 10 − \frac{y}{2}

y = 20 − 2 x

2: x = \frac{25}{y}

y = \frac{25}{x}

Step-by-step explanation:

6 0
3 years ago
A number is increased by five and squard
guajiro [1.7K]
5+n with a small 2 in the top right hand corner of the n
3 0
4 years ago
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