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Novosadov [1.4K]
3 years ago
11

19. Why are the substitution and elimination methods necessary when we already know how to solve systems of linear equations usi

ng the graphing method?
Mathematics
1 answer:
Marizza181 [45]3 years ago
6 0

Answer:

There are situations in which you may be required to solve a system of equations and no graph is present or available. In these instances, substitution and elimination are very effective solution methods.

Step-by-step explanation:


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Last week Karen spent $121.35 on food for her family. She only has $200 to spend every two weeks. How much does hse have left to
yan [13]

Answer:

$78.65

Step-by-step explanation:

take 200-121.35=78.65

$78.65

5 0
3 years ago
Read 2 more answers
For the given function f(x) = 2.6x + 4.3, x is the number of years since 2000 and y (or f(x)) is the percent of students taking
dsp73

Answer:

  in 2005, 17.3 percent of students are taking at least one online course

Step-by-step explanation:

f(5) = 2.6(5) +4.3 = 17.3

The definition of the function f(x) tells you that f(5) = 17.3 means 5 years after the year 2000, 17.3 percent of students are taking at least one online course.

7 0
3 years ago
Find the equation of the line passing
Paraphin [41]
Rearrange the formula given to determine the slope, you will see that in y=mx+b form the slope is -2/3
You now have the slope (m) and two test points. Input those values into y=mx+b and you will have your answer!
I got y=(-2/3)x+(22/3) which I'm quite certain is correct.
8 0
3 years ago
Expand: In (4a)^3<br> help please
Gala2k [10]

Answer: 3ln4 + 3lna

Step-by-step explanation:

\ln (4a)^{3}\\=3 \ln 4a\\=3(\ln 4+\ln a)\\=\boxed{3\ln 4+3\ln a}

4 0
1 year ago
One number is 3 less than twice another. If their sum is 39 find the numbers
DedPeter [7]

Answer:

The numbers are 14 and 25

Step-by-step explanation:

Let one of the numbers be x. The second number we are told is 3 less than twice x. The second number will thus be;

2x - 3

The sum of the numbers is thus;

x + (2x - 3) = 3x - 3

But the sum of the numbers is said to be 39, therefore;

3x - 3 = 39

3x = 42

x = 14

The second number is thus;

2(14) - 3 = 28 - 3 = 25

5 0
3 years ago
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