All categories

3 years ago

Please solve with elimination

Mathematics

1 answer:

pshichka [43]3 years ago

6 0

Answer:

Step-by-step explanation:

5x+9y=-3 Multiply both sides by 8

40x+72y=-24

-53x-8y=-3 Multiply both sides by 9

-477x -72y= -27

sum the equations vertically to eliminate one variable

40x+72y= -24

-477x-72y= -27 (the y cancels out )

-477x =-51 (-24 + -27=-51)

-477x=-51 / -477 divide both sides by -477

x =51/437

5x 51/437=9y= -3 substitute the value of x

y= -174 /437

(x,y) = (51/437, -174/437)

You might be interested in

Dividing by the wrong number when finding the mean is a:

TiliK225 [7]

Answer:

Measurement error. Took the quiz and got it right.

Step-by-step explanation:

3 0

3 years ago

Which shows the expression below in simplified form? (7 × 10-3) - (2.3 × 10-6) A. 6.9977 × 10-3 B. 6.99977 × 10-3 C. 6.9977 × 10

rosijanka [135]

Option A

$(7 \times 10^{-3}) - (2.3 \times 10^{-6}) = 6.9977 \times 10^{-3}$

<em><u>Solution:</u></em>

Given expression is:

$(7 \times 10^{-3}) - (2.3 \times 10^{-6})$

To evaluate the expression, let us make the exponent of 10 same

$2.3 \times 10^{-6} = 0.0023 \times 10^{-6+3} = 0.0023 \times 10^{-3}$

[ Here, decimal point is moved three times left, so add 3 ]

Therefore,

$(7 \times 10^{-3}) - (2.3 \times 10^{-6}) = (7 \times 10^{-3}) - (0.0023 \times 10^{-3})$

$\text{Take the } 10^{-3} \text{ as common }$

$(7 \times 10^{-3}) - (0.0023 \times 10^{-3}) = 10^{-3}(7-0.0023)\\\\\text{ Solve for terms inside the bracket }\\\\(7 \times 10^{-3}) - (0.0023 \times 10^{-3}) = 10^{-3} \times 6.9977\\\\\text{Therefore, the simplified expression is: }\\\\(7 \times 10^{-3}) - (0.0023 \times 10^{-3}) = 6.9977 \times 10^{-3}$

Thus Option A is correct

6 0

4 years ago

I need help on this one so please can someone help me with this thanks

BlackZzzverrR [31]

Answer:

the price of each cd is 13.45

Step-by-step explanation:

give me brainly

7 0

3 years ago

Select the statement that is known to be true.

ser-zykov [4K]

Answer:

c) there is an efficient algorithm to test whether an integer is prime

Step-by-step explanation:

The basis of modern cryptography is the fact that factoring large numbers is computationally difficult. No algorithm is efficient for that purpose.

<h3>Choices</h3><h3>a)</h3>

False - there is no known efficient algorithm for factoring large numbers

False - there are 78,498 prime numbers less than 1,000,000. That is about 8% of them--far from being "most of the integers."

True - a variety of algorithms exist for testing primality. In 2002, a test was published that runs in time roughly proportional to the 7.5 power of the logarithm of the number being tested.

False - there is no known efficient algorithm for factoring large numbers

7 0

1 year ago

3 x 10 + 2 x 1 + 6 x 1/100 +4 x 1/1000 is the expanded form of which decimal?

lukranit [14]

Answer:

32.064

Step-by-step explanation:

7 0

3 years ago