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
Nuetrik [128]
2 years ago
7

Which value of x satisfies both -9x + 4y = 8 and -3x − y = 4 given the same value of y?

Mathematics
2 answers:
liq [111]2 years ago
4 0

Answer:

C

Step-by-step explanation:

Since y will have same value, y doesn't really matter. Thus,

We can solve for y in the 2nd equation as:

-3x - y = 4

-3x - 4 = y

Now we can plug it into the first and solve for x:

-9x + 4y = 8

-9x + 4(-3x - 4) = 8

-9x - 12x - 16 = 8

-21x = 8 + 16

-21x = 24

x = 24/-21

x = -8/7

Correct answer is C.

Alisiya [41]2 years ago
3 0

Answer: Option C

C-8/7

Step-by-step explanation:

We have the following equations

 -9x + 4y = 8 and -3x - y = 4

We want to find a value of x that satisfies both equations and obtains the same value of y.

To find the value of x, clear the value of y in both equations

-9x + 4y = 8\\\\-9x + 4y -8 = 0\\\\-9x -8 = -4y\\\\y = \frac{9}{4}x +2

------------------------------

-3x - y = 4\\\\\-3x -y - 4 = 0\\\\y = -3x -4

Now solve both equations and solve for x.

\frac{9}{4}x +2 = -3x -4\\\\\frac{21}{4}x = -4-2\\\\\frac{21}{4}x = -6\\\\21x = -24\\\\x = -\frac{24}{21}\\\\x = -\frac{8}{7}

The answer is x = -\frac{8}{7}

You might be interested in
Maria wants to buy a new phone researching realized that the best price and 147.86 US dollars at the time of purchase it still a
ella [17]

Answer:

0.6763154335

Step-by-step explanation:

because. 10%is the same as 10 over 100 .because percent means 100. so you say 100÷10=10. then you say 10×14.786. this is how I got the answer.

7 0
3 years ago
Answer the attached question ASAP!!!​
ch4aika [34]
The answer is A (1, -3)
6 0
2 years ago
Please say me the answer fast and correct.... ​
Kruka [31]

Answer:

i dont know lol

3 0
3 years ago
Your car's back window is in the shape of a trapezoid with the dimensions shown. The 1616-inch window wiper cleans a part of the
ExtremeBDS [4]
<span>Semicircle area = circle area / 2 = (pi*r^2)/2 16 in is the radius. Let's call the area of this semicircle s. 3.14*16^2=s

</span><span>Trapezoid area = ((base 1 + base 2) / 2) * h Here, base 1 is 44 and base 2 is 36. The height (h) is 20. Let's call this trapezoid's area t. (44+36)/2 *20 = t
</span>
<span>We can remove the area of the semicircle (that created by the windshield wiper) by subtracting it from the area of the trapezoid. t - s = uncleaned area [(44+36)/2 * 20] - [3.14 * 16^2] = uncleaned area</span>
5 0
2 years ago
Read 2 more answers
What is 8 1/4 divided by 3 1/2?
rusak2 [61]

Answer:

2 5/14

Step-by-step explanation:

6 0
2 years ago
Other questions:
  • The point-slope form of the equation of the line that passes through (–5, –1) and (10, –7) is y plus 7 equals negative StartFrac
    9·2 answers
  • Find set of values of experssion (x + y)(3 - 4xy) if x ^ 2 + y ^ 2 = 3
    7·1 answer
  • A study reported that finger rings increase the growth of bacteria on health-care workers' hands. Research suggests that 31 perc
    6·2 answers
  • If f(x)=(x+1)(x-2)(x-3) represent a student's displacement from school, what changes would g(x)=-0.5(x-9)(x-12)(x-13)+6 entail?
    8·1 answer
  • Which expression is equivalent to sqrt8/x^6? Assume x &gt; 0
    10·2 answers
  • In a drawer, there are 6 white socks, 4 black socks, and 2 brown socks. You pick out a
    15·1 answer
  • What is the perimeter of this rectangle?
    11·1 answer
  • X/2-1=3 what is X PLEASE HELPPPPPPPPPPP
    10·2 answers
  • I WILL GIVE BRAINLY POINTS!!!
    14·2 answers
  • A recipe has a ratio of 1 1/2 cups of cheese to 6 oz. of pasta. Based on this recipe, which statement is true?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!