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Zanzabum
3 years ago
10

16 POINTS

Mathematics
1 answer:
Marta_Voda [28]3 years ago
8 0
Solve the following system using elimination:
{7 x + 2 y = -19 | (equation 1)
{2 y - x = 21 | (equation 2)

Add 1/7 × (equation 1) to equation 2:
{7 x + 2 y = -19 | (equation 1)
{0 x+(16 y)/7 = 128/7 | (equation 2)

Multiply equation 2 by 7/16:
{7 x + 2 y = -19 | (equation 1)
{0 x+y = 8 | (equation 2)

Subtract 2 × (equation 2) from equation 1:
{7 x+0 y = -35 | (equation 1)
{0 x+y = 8 | (equation 2)

Divide equation 1 by 7:
{x+0 y = -5 | (equation 1)
{0 x+y = 8 | (equation 2)

Collect results:
Answer: {x = -5, y = 8
You might be interested in
Lisa made a shirt using 1/3 m of blue fabric and 3/5 m of red fabric how many meters of fabric did she use in all
Marysya12 [62]

Answer: 14/15 of a meter

Step-by-step explanation:

5 and 3 LCM is 15.

3/5 x 3 + 1/3 x 5= 9/15 + 5/ 15 = 14/15

5 0
2 years ago
The number of decimal places in the product will be sum of the factor"s decimal place.So the product will have 1,2,3 or 4 decima
vampirchik [111]

Answer:

0.47 \to 2\ digits

3.2 \to 1\ digit

Product \to 3\ digits

Step-by-step explanation:

Given

0.47 * 3.2 =

See comment for complete question

Required

The number of decimal places

To do this, we simply calculate the number of digits after the decimal points

0.47 \to 2\ digits

3.2 \to 1\ digit

The product is the sum of the digits above 2 + 1 = 3

Hence:

Product \to 3\ digits

6 0
3 years ago
suppose that you have 3000$ to invest. which investment yields the greater return over a 10 year period: 8.04% compounded daily
Ksenya-84 [330]

Answer:  Option A: 8.04% compounded daily

<u>Step-by-step explanation:</u>

A = P\bigg(1+\dfrac{r}{n}\bigg)^{nt}\qquad where\\\\\bullet A = \text{accrued amount (principal plus interest earned)}\\\bullet P = \text{principal (amount invested)}\\\bullet r = \text{rate (in decimal form)}\\\bullet n=\text{number of times compounded in one year}\\\bullet t=\text{time (number of years)}\\\\\\Option\ A:\\A = \text{unknown}\\P=3000\\r=8.04\%\rightarrow 0.0804\\n=\text{daily}\rightarrow 365\\t=10\\\\A=3000\bigg(1+\dfrac{0.0804}{365}\bigg)^{365\times 10}\\\\.\ =\$ 6,702.79

Option\ B:\\A = \text{unknown}\\P=3000\\r=8.1\%\rightarrow 0.081\\n=\text{quarterly}\rightarrow 4\\t=10\\\\A=3000\bigg(1+\dfrac{0.081}{4}\bigg)^{4\times 10}\\\\.\ =\$ 6,689.37

Option A results in the greater amount of money.

7 0
3 years ago
BRAINLIEST HELP!!! Simplify the expression; -15+[(6-1)-(-1-19)]
Korolek [52]

The answer you want will be 10.

Hope it helps!!

6 0
3 years ago
Read 2 more answers
PLEASEE HELP QUICKLY
umka21 [38]
It’s letter B bro because
7 0
3 years ago
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