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azamat
2 years ago
13

If 7x+2y =3 and x-3y=30, what is the value of y?​

Mathematics
1 answer:
larisa [96]2 years ago
6 0

Answer:

-9

Step-by-step explanation:

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PLEASE HELP AND ANSWER BOTH QUESTIONS
nydimaria [60]
D is your answer

Expand and do FOIL method (first outside inside last)
simplify and then choose right answer

A is your answer

Do the same thing

hope this helps
3 0
3 years ago
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If using the method of completing the square to solve the quadratic equation x^2-4x+10=0,which number would have to be added to
chubhunter [2.5K]

Answer:

4

Step-by-step explanation:

Given

x² - 4x + 10 = 0

subtract 10 from both sides

x² - 4x = - 10

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(- 2)x + 4 = - 10 + 4

(x - 2)² = - 6

To complete the square add 4

5 0
3 years ago
Identify the type of observational study​ (cross-sectional, retrospective, or​ prospective) described below. A research company
shepuryov [24]

Answer:

Cross Sectional

Step-by-step explanation:

A cross sectional is one in which an association is developed between a risk factor or an outcome.

In the given question the device is used to record the viewing habits of about 2500 ​households, and the data collected today will be used to determine  the proportion of households tuned to a particular news program. There will be risk factor in today's research with the future developed program which will the outcome.

For example there are 20 students in my class who cannot write. So I develop a program to help them write. But the next year there may not be any student who would require such help.So there's a risk factor associated with the outcome.

Cross sectional results are recorded in a two ways table showing do's and don'ts.

7 0
2 years ago
What is the value of the expression shown below?
anyanavicka [17]
The answer to this is <span>4 and 9 over 16.</span>
3 0
3 years ago
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I HAVE 5 MINUTES PLEASE HELP ! ( slope )
astraxan [27]

Answer:

1/2x+b=y

1/2*4+b=3

2+b=3

b=1

1/2x+1=y

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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