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Pavlova-9 [17]
3 years ago
7

Solve the following system of equations

Mathematics
1 answer:
Katyanochek1 [597]3 years ago
8 0

Answer:

x = -9

y = -3

Step-by-step explanation:

We can first multiply the 2nd equation by -6, so we have:

-6*[-0.8x+0.4y=6]\\=4.8x-2.4y=-36

Now, we add up this equation to the 1st equation given to eliminate y and solve for x. Shown below:

1.2x+2.4y=-18\\4.8x-2.4y=-36\\---------\\6x=-54\\x=-9

So, we have the value of x to be -9

Now, we substitute this value in 1st equation and solve for y:

1.2x+2.4y=-18\\1.2(-9)+2.4y=-18\\-10.8+2.4y=-18\\2.4y=-7.2\\y=-3

The value of y is -3

So,

<u>x = -9</u>

<u>y = -3</u>

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Help! ASAP ONLY IF YOU KNOW ty!
agasfer [191]

Answer: 115 degrees

Step-by-step explanation:

Since a kite has one pair of opposite angles which are congruent, W and Y must be congruent because X and Z are not.

The sum of the angles in any quadrilateral is 360 degrees. We know two of the angles as 90 degrees and 40 degrees, so the sum of the other two angles must be 360-90-40 = 230 degrees.

We know that W and Y must be equal so each of them is equal to 230/2 degrees = 115 degrees.

4 0
3 years ago
If 20% of a number p is 10, what is 10% of p?
kobusy [5.1K]

Answer:

5

Step-by-step explanation:

20% of p = 10

20% = 0.2

Multiply

0.2p = 10

Multiply both sides of the equation by 5

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Multiply

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5

10% of p is 5

Hope this helps :)

8 0
3 years ago
Read 2 more answers
Select all the right triangles, given the length of the sides
Dahasolnce [82]

Answer:

B, E

Step-by-step explanation:

Needs a 3:4:5 ratio, or, if it is an isosceles triangle, then n:n:nsqrt(3)

3 0
2 years ago
Beth solved the system of equations by making a substitution for y in the second equation. What equation did she get as a result
Slav-nsk [51]
Hello there!

The correct answer is option C

3x + 20x - 55 = -9


I am not sure if you wanted some more details but I hope this helps and if you do, just let me and I will edit it.

Good luck with your studies!

Happy New Year!~
3 0
3 years ago
Steven's mother asked him to buy 750 grams of sugar. At the supermarket, he finds that the sugar packages give the weight in kil
Georgia [21]

Answer:

0.75 kilograms

Step-by-step explanation:

All you need to do is move the decimal.

7 0
4 years ago
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