1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Genrish500 [490]
2 years ago
9

Solve the system of equations. -5x+2y=9. y=7x

Mathematics
1 answer:
il63 [147K]2 years ago
7 0

- 5x + 2y = 9 \\ y = 7x \\  \\  - 5x + 2 \times 7x = 9 \\  - 5x + 14x = 9 \\ 9x = 9 \\ x = 1 \\  \\ y = 7 \times 1 = 7 \\

Answer: (1; 7)

You might be interested in
HELPPPPPPP on this question.! I need to pass.
timurjin [86]

9514 1404 393

Answer:

  12.25 (or -18.75)

Step-by-step explanation:

If you pay attention to the square of a binomial, ...

  (x -a)² = x² -2ax +a²

You see that the constant (a²) is the square of half the x-coefficient. That is, the x-coefficient is -2a, half that is -a, and the square of that is (-a)² = a².

In your equation, the x-coefficient is -7, half that is -3.5, and the square of that is 3.5² = 12.25.

So, you can think of this ambiguous question in a couple of ways.

<u>Concern is only with the x-terms</u>:

  x² -7x +31 = (x² -7x +12.25) +31 = 12.25 . . . . . . add 12.25 to both sides

  (x -3.5)² +31 = 12.25 . . . . write the x-terms as a square

<u>Concern with the equation overall</u>:

You want the end result to have the x-terms in the form of the square ...

  (x -3.5)² = x -7x +12.25

The left side of the equation can be put in that form by adding -18.75 to both sides;

  x² -7x +31 -18.75 = -18.75 . . . . . . add -18.75 to both sides

  x² -7x +12.25 = -18.75 . . . . . . . . . simplify

  (x -3.5)² = -18.75 . . . . . . write the left side as a square

__

The short of it is that we're not sure what the question is asking for exactly. The "help video" would probably clarify the intent. Most likely, you're concerned with adding the square of half the x-coefficient, 12.25.

3 0
2 years ago
23 POINTS please help me
Arturiano [62]

Answer:

y = x + 2

Step-by-step explanation:

Each y variable is set to be two more than the x variable. This makes the the slope intercept form y = x + 2.

3 0
2 years ago
Please answer this I need help asap
Yanka [14]

Answer:

(12, 48 )

Step-by-step explanation:

Given the 2 equations

y = 5x - 12 → (1)

y = 3x + 12 → (2)

Substitute y = 5x - 12 into (2)

5x - 12 = 3x + 12 ( subtract 3x from both sides )

2x - 12 = 12 ( add 12 to both sides )

2x = 24 ( divide both sides by 2 )

x = 12

Substitute x = 12 into either of the 2 equations and evaluate for y

Substituting into (2)

y = 3(12) + 12 = 36 + 12 = 48

solution is (12, 48 )

8 0
3 years ago
Which is not a factor of 48? A. 8 B. 14 C. 16 D. 24
alexira [117]
14 is not a factor of 48
7 0
3 years ago
Read 2 more answers
If M and N are midpoints in a diagram below, determine values for x and y
lianna [129]
Research scientists use a standard practice called the _____ method to help them understand phenomena.
5 0
3 years ago
Read 2 more answers
Other questions:
  • Heidi solved the equation 3(x + 4) + 2 = 2 + 5(x – 4). Her steps are below: 3x + 12 + 2 = 2 + 5x – 20 3x + 14 = 5x – 18 14 = 2x
    6·2 answers
  • How do you do a unit rate?
    9·1 answer
  • 200,000+80,000,+300+7
    7·1 answer
  • It costs $520 to planf 4 acres of corn .how much would it cost to plant 0.6 acre of corn
    15·1 answer
  • You have recorded your car mileage and gasoline use for 5 weeks Estimate the
    14·2 answers
  • Simplify:<br> (Xy/3z/4)/4
    14·2 answers
  • Hat logarithmic function represents the data in the table?
    13·2 answers
  • What is the discriminant of the quadratic equation 3-3x=-6x^2?<br> -68<br> -56<br> 76<br> 88
    15·1 answer
  • Given m||n, find the value of x.
    10·2 answers
  • If each customer takes 3 minutes to check out, what is the probability that it will take more than 9 minutes for all the custome
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!