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Aleks04 [339]
3 years ago
13

Solve the system of linear equations. separate the x- and y- values with a coma.

Mathematics
1 answer:
Katarina [22]3 years ago
7 0
The Answer is x=7, y=6

Solve the following system:
{14 x - 4 y = 74 | (equation 1)
{7 x - 7 y = 7 | (equation 2)
Subtract 1/2 × (equation 1) from equation 2:
{14 x - 4 y = 74 | (equation 1)
{0 x - 5 y = -30 | (equation 2)
Divide equation 1 by 2:
{7 x - 2 y = 37 | (equation 1)
{0 x - 5 y = -30 | (equation 2)
Divide equation 2 by -5:
{7 x - 2 y = 37 | (equation 1)
{0 x+y = 6 | (equation 2)
Add 2 × (equation 2) to equation 1:
{7 x+0 y = 49 | (equation 1)
{0 x+y = 6 | (equation 2)
Divide equation 1 by 7:
{x+0 y = 7 | (equation 1)
{0 x+y = 6 | (equation 2)
Collect results:
Answer:  {x = 7
                {y = 6

P{lease note the brackets are supposed to go over both equations but I haven'y been able to find a way to make it work, see attachment.

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Given the function f(x) = 3x, find the value of f−1(27). f−1(27) = 1 f−1(27) = 3 f−1(27) = 9 f−1(27) = 81
Mariulka [41]
Fun fact
if f(a)=b then f⁻¹(b)=a
so
if f⁻¹(b)=a then f(a)=b
 
so we find f(x)=27 and the solve for x

f(x)=3x=27
3x=27
divide both sides by 3
x=9

so if f(9)=27 then f⁻¹(27)=9
problem solved

answer is 9
7 0
3 years ago
Factor over the complex numbers, if possible: x² + 2xyi - y2<br><br> What is the answer?
yanalaym [24]

9514 1404 393

Answer:

  (x +yi)²

Step-by-step explanation:

Comparing the given expression to the square of a binomial, we can determine the given expression to be a square.

  (a +b)² = a² +2ab +b²

Here, we have a=x and b=yi. Then the factorization is ...

  x² +2xyi +(yi)² = (x +yi)²

8 0
3 years ago
The 2.5% of people who slept the most got more sleep than how many hours of sleep
docker41 [41]
Based on lifelike statistics, I would say they got more sleep than about 8-10 hours.
6 0
2 years ago
Please help again with the following 2 questions
yuradex [85]
Perimeter top one:
5+1+2+3+3+4= 18in

Perimeter bottom one:
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3 0
3 years ago
Please help asap!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
vladimir2022 [97]
First one is 42
second is 24
Third is 12
3 0
2 years ago
Read 2 more answers
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