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2 years ago

Solve system of equation using elimination by addition. Will give brainliest!!

Mathematics

1 answer:

emmasim [6.3K]2 years ago

8 0

Answer:

$x = 2, y = -1$

Step-by-step explanation:

We can add the 2 equations together to solve for y.

$(-3x + 5y) + (3x + 7y) = (-11) + (-1)\\-3x + 3x + 5y + 7y = -11 -1\\12y = -12\\y = -1$

Now we can solve for x by substituting y in one of the original equations.

$3x + 7y = -1\\3x + 7(-1) = -1\\3x - 7 = -1\\3x = 6\\x = 2$

Those are the answers

- Kan Academy Advanced

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Helpp me please!!!!!!

Alexeev081 [22]

Answer:

a. Inscribed angle = <WXY

b. Minor arc = arc(XY)

c. VWX

d. m(VWX) = 180°

e. m<VUW = 110°

Step-by-step explanation:

a. The angle, <WXY has its vertex on the circumference of the circle. Therefore, it can be referred to as an inscribed angle of the circle with center U.

Inscribed angle = <WXY

b. Arc(XY) is a minor arc because it is smaller than half of circle with center U.

Minor arc = arc(XY)

c. A semicircle is half of a full rotation for a circle. From the diagram, a semicircle is VWX

d. m(VWX) = Half the rotation of a full circle = 180°

e. m<VUW = arc(VW) (measure of central angle = measure of arc)

m<VUW = 110° (Substitution)

3 0

3 years ago

PC=PD then (PA)PC)=(PB)(___)

yKpoI14uk [10]

Answer:

PD is the answer

Step-by-step explanation:

(PA) (PC) = (PB) (PD)

6 0

3 years ago

Need Help ;( This table shows the calories of several sandwiches at a restaurant. Find the mean and mean absolute deviation of t

jolli1 [7]

Answer:

The mean is 307 the absolute deviation is 42

7 0

3 years ago

Read 2 more answers

What is 27% of 81 using the Decimals strategy?

NemiM [27]

27%=(27/100)=0.27

0.27*81=21.87

Hope this helps!!

4 0

3 years ago

Read 2 more answers

An artist used silver wire to make a square that has a perimeter of 40 inches. She then used copper wire to make the largest cir

finlep [7]

Answer:

The area of the copper circle is <u>31.4 inches</u>.

Step-by-step explanation:

Given:

An artist used silver wire to make a square that has a perimeter of 40 inches.

She then used copper wire to make the largest circle that could fit in the square, with perimeter of 40 inches.

Use 3.14 to represent π.

Now, to find the area of the copper circle.

Perimeter of square = 40 inches.

So, we get the side of square by putting formula:

$Perimeter=4\times side$

$40=4\times side$

Dividing both sides by 4 we get:

$10=side.$

$Side=10\ inches.$

Now, as the side of square is 10 inches it is the diameter of the circle as the square is fit inside the circle:

For getting the area of circle we find the radius:

Radius (r) = $\frac{Diameter}{2} \\=\frac{10}{2}= 5\ inches.$

Now, putting the formula to get the area of the circle:

$Area=2\times \pi \times r$

$Area=2\times 3.14\times 5$

$Area=31.4\ inches.$

Therefore, the area of the copper circle is 31.4 inches.

6 0

3 years ago