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3 years ago

11

What is x? 3x+4y=70 and 8x-3y=9

1 answer:

love history [14]3 years ago

5 0

I am pretty sure x is 6

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I'm not sure about 38 - 53 please help! :)

Maru [420]

38. 6900 grams
39. 19600 grams
40. 27910 grams
41. 32840 grams
42. 610 grams
43. 970 grams
44. 3712 grams
45. 8937 grams
46. 37 grams
47. 69 grams
48. 1510 grams
49. 4700 grams
50. 150 grams
51. 15 grams
52. 15200 grams
53. 460

I'm sorry if these are wrong but I hope this could help.

5 0

3 years ago

Read 2 more answers

Let II be the tangent plane to the graph of f(x, y) = 8 – 2x^2 – 3y^2 at the point (1, 2,-6). Let S, x² + y^2 + z = 4 be another

stealth61 [152]

Let $F(x,y,z)=f(x,y)-z$ . The tangent plane to $f(x,y)$ at (1, 2, -6) has equation

$\nabla F(1,2,-6)\cdot(x-1,y-2,z+6)=0$

We have

$\nabla F(x,y,z)=(-4x,-6y,-1)\implies\nabla F(1,2,-6)=(-4,-12,-1)$

Then the tangent plane has equation

$(-4,-12,-1)\cdot(x-1,y-2,z+6)=0\implies -4(x-1)-12(y-2)-(z+6)=0\implies 4x+12y+z=22$

Let $g(x,y)=4-x^2-y^2$ , and $G(x,y,z)=g(x,y)-z$ . The tangent plane to $S$ at a point $(a,b,c)$ is

$\nabla G(a,b,c)\cdot(x-a,y-b,z-c)=0$

We have

$\nabla G(x,y,z)=(-2x,-2y,-1)\implies \nabla G(a,b,c)=(-2a,-2b,-1)$

so that this plane has equation

$(-2a,-2b,-1)\cdot(x-a,y-b,z-c)=0\implies2ax+2by+z=2a^2+2b^2+c$

In order for this plane to be parallel to the previous plane, we need to have

$\begin{cases}2a=4\\2b=12\end{cases}\implies a=2,b=6\implies g(a,b)=c=-36$

so the point we're looking for is (2, 6, -36).

6 0

3 years ago

I need ur help please.....

Kruka [31]

Answer:

<h2>25 kg option b</h2>

Step-by-step explanation:

let father s weight be 3x

son s weight be x

3x- x = 50

2x = 50

x =25

3 0

3 years ago

Choose Yes or No to tell whether the expressions are equivalent.

Savatey [412]

Answer:

(4^3)3 and 4^3 • 4^3 = 192 and 4096 = No

(3^4)^4 and 3^8 • 3^8 = 43046721 and 43046721 = Yes

6^4 • 3^4 and 18^8 = 104976 and 11019960576 = No

4^3 • 5^3 and 2^0 = 8000 and 1 = No

8 0

3 years ago

Which equation represents a proportional relationship? A) y = 1/4 x B) y = 1/4 x + 1 C) y = 1/4 x + 4 D) y = 1/4 x + 1/4

AfilCa [17]

Answer:

That would be A

Step-by-step explanation:

y = 1/4 x

y is directly proportional to x.

6 0

3 years ago

Read 2 more answers