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3 years ago

Using substitutionx + 2y = 17x + y = 11

Mathematics

2 answers:

andre [41]3 years ago

7 0

Answer:

(x,y)=(5,6)

Step-by-step explanation:

Naddika [18.5K]3 years ago

3 0

Answer:

X=17-2y

Substitute y with 6 as 6*2=12

12+x=17

X=17-2*6

X =5

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Explain why solving the equation - 3n - 4 = 2 is different from solving the

Klio2033 [76]

Answer:

Step-by-step explanation:

First get the answer to -3n - 4 = 2

-3n - 4 + 4 = 2 + 4

-3n = 6

n = 6/-3

n = -2

That answer is the only one that is permitted. It is the only one that completely satisfies the equation.

Now when you do the inequality, look what happens.

-3n - 4 < 2 Add 4 to both sides.

-3n-4+ 4 < 2+4

-3n < 6 Now there are a bunch of ways (2) to solve this.

No matter which way you do it, the arrow will change.

-3n/-3 > 6/-3

n > - 2

That means that any number that is greater than - 2 will satisfy the inequality.

So n = 0 will work. Even n = - 1 will work. Anything bigger than -2 will work. The equation does not provide that kind of latitude.

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3 years ago

Why do people post Khan Academy questions here?

valentina_108 [34]

Answer:

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

If the flare is launched with an initial velocity of 144 feet per second, find the height after 2 seconds. The answer is not 288

salantis [7]

Answer:

The height = 223.6 ft

Step-by-step explanation:

∵ Initial velocity (u) = 144 ft/sec

∵ t = 2 sec

∵ a = - 32.2 ft/sec²

∵ h = ut + 1/2 at²

∴ h = 144(2) +1/2 (-32.2 × 4) = 288 + 1/2( -128.8) = 223.6 ft

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3 years ago

If the cost of an item increased by a percentage and decreased by the same percentage, what would that percentage be if the new

Orlov [11]

The percentage, if the new cost was 84% of the original is 40%

Let the cost of the item be x.

When the price increased by y%, the new price is:

$New =x \times (1 + y\%)$

When the price decreased by the same percentage (i.e. y%), the new price is:

$New =x \times (1 + y\%) \times (1 - y\%)$

The cost is said to be 84% of the original price.

So, we have:

$x \times (1 + y\%) \times (1 - y\%) =84\% \times x$

Divide both sides by x

$(1 + y\%) \times (1 - y\%) =84\%$

Apply the difference of two squares

$1 - (y\%)^2 =84\% \\\\$

Subtract 1 from both sides of the equation

$- (y\%)^2 =-16\%$

Cancel out the common factors

$(y\%)^2 =16\%$

Take the square root of both sides

$y\% =0.4$

Multiply both sides by 100

$y =40$

Hence, the percentage is 40%

Read more about percentage change at:

brainly.com/question/809966

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3 years ago

Two angles of a quadrilateral are supplementary. One of them is 4 less than twice the other. What is the measure of the larger a

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3 years ago

Using substitutionx + 2y = 17x + y = 11​

Using substitutionx + 2y = 17x + y = 11