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ch4aika [34]
2 years ago
13

Solve each system by elimination. -2x + 8y = -30 9x - 16y = 15

Mathematics
2 answers:
galina1969 [7]2 years ago
5 0

Answer: −0.147540984 or 1.911885246

tresset_1 [31]2 years ago
4 0

Answer:

(-9, -6)

Step-by-step explanation:

-2x+8y=-30

9x-16y=15

Start by multiplying the first equation by 2:

-4x+16y=-60

Now, add the two equations to eliminate y:

9x-4x=15-60

    5x=-45

Divide both sides by 5

x=-9

Plug -9 in for x to solve for y:

-2(-9)+8y=-30

18+8y=-30

Subtract 18 from both sides

8y=-48

Divide both sides by 8

y=-6

(x,y)=(-9,-6)

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In the function y = -5x2 + 5 , the graph will open down, be shifted up 5 units, and it will be wider than the parent function y
masya89 [10]
We are considering the function y=f(x)=-5 x^{2} +5

the graph of this function is the graph of the parent function y=g(x)= x^{2} after applying the following steps.

1. multiply by -1:

-x^{2} is x^{2} reflected with respect to the x-axis.


2. multiply by 5:

-5x^{2} is -x^{2} shrinked towards the y axis. 

for example, consider x=1/2

 -5x^{2}=-5( \frac{1}{2} )^{2}=-5* \frac{1}{4}= \frac{-5}{4}=-1.25

 -x^{2}=- ( \frac{1}{2} )^{2}=- \frac{1}{4}=-0.25

now this means that -5x^{2} is "lower" than -x^{2}, which means there is a shrinking of the graph.

3. add 5:

-5 x^{2} +5 is -5 x^{2} shifted 5 units up.


4.

so the graph of the function a) opens down, b) is shifted 5 units up, c) is not wider than the parent function



Answer: False
6 0
4 years ago
The form he builds is 40 1/2 in. long, 10 in. deep, and 8 in. high. How much cement is needed to fill the form ​
DedPeter [7]

This question clearly states that it is a 'find the volume' question.

Given dimensions of the object are :

Length of the object = 40\frac{1}{2} inches or 40.5 inches

Depth of the object = 10 inches

Height of the object is = 8 inches

So, the volume becomes = 40.5\times10\times8 = 3240 cubic inch

Hence, the amount of cement needed is 3240 cubic inches.

4 0
4 years ago
I need help with this question
nikdorinn [45]
The area of each triangular face is
.. A = (1/2)*b*h
.. Aside = (1/2)*(6 cm)*(5 cm) = 15 cm^2

The area of the triangular base is
.. Abase = ((√3)/4)*s^2 = (√3)/4*(6 cm)^2 = 9√3 cm^2

The total surface area is the base area plus the area of the three sides.
.. Atotal = Abase + 3*Aside
.. = 9√3 cm^2 +3*15 cm^2
.. = (45 +9√3) cm^2
.. ≈ 60.6 cm^2


Actually, there's an error in the picture. The height of the side should be 4, and the length of the edge should be 5. Making that adjustment, the total area is 51.6 cm^2.

It is hard to tell what is intended. Not all answers are showing, so we can't "reverse-engineer" the problem from the answers.
7 0
4 years ago
10 QUESTIONS FOR THE TOTAL OF 50 POINTS!! PLEASE ANSWER QUICKLY!!!!! I NEED HELP AND FAST!!! AND WILL MARK BRAINLIEST!!!
prohojiy [21]

Answer:

  1. B) 48
  2. D) 81
  3. A) 11
  4. B) -81
  5. -246
  6. C) 5
  7. A) 19 9/25
  8. D) 11
  9. A) 48
  10. D) m-c/-b =a

Step-by-step explanation:

comment if you want the explanation, but you said you wanted it fast and it would take me like 10 minutes to right it all out

8 0
4 years ago
Read 2 more answers
Find the slope of the surface in the x and y-directions at the given point. h(x,y) = x2 – y2 (-3, 2, 5)
belka [17]
If h(x,y)=x^2-y^2, then you can find partial derivatives: 
\frac{dh}{dx} =2x  \\  \frac{dh}{dy} =-2y.

At point A(-3,2,5) (this is the point which lies on the surface, because 5=(-3)^2-2^2=9-4=5) these derivatives have values:

\frac{dh}{dx} |_A=2\cdot (-3)=-6 \\  \frac{dh}{dy} =-2\cdot 2=-4 -- the slopes at x and y- directions, respectively.



8 0
3 years ago
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