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
ehidna [41]
3 years ago
9

What’s the value of x

Mathematics
2 answers:
kozerog [31]3 years ago
6 0
Answer should be:

X=9.
Katyanochek1 [597]3 years ago
6 0
Answer is 9 I think
You might be interested in
Solve the system of equations.
Xelga [282]

Answer:

  b.  x=1, y=2, z=3

Step-by-step explanation:

The system of equations ...

  • 3x +2y +z = 10
  • 9x -6y +z = 0
  • x -y -3z = -10

has solution (x, y, z) = (1, 2, 3) . . . . matches choice B.

_____

While it is convenient to solve this using a graphing calculator or web site, one can easily solve the system by hand.

Subtract the second equation from 3 times the first:

  3(3x +2y +z) -(9x -6y +z) = 3(10) -(0)

  12y + 2z = 30 . . . . simplify

Dividing this result by 2 gives ...

  6y +z = 15 . . . . . . [eq4]

Subtract 3 times the third equation from the first:

  (3x +2y +z) -3(x -y -3z) = (10) -3(-10)

  5y +10z = 40 . . . . simplify

  y + 2z = 8 . . . . . . . divide by 5 . . . . . [eq5]

The two equations [eq4] and [eq5] can be solved any of the ways you usually solve two equations in two variables. Here, we'll use the first equation to write an expression for z that we can substitute into the second equation.

  z = 15 -6y . . . . . subtract 6y from [eq4]

  y + 2(15 -6y) = 8 . . . . . substitute for z in [eq5]

  -11y +30 = 8 . . . . . simplify

  -11y = -22 . . . . . . . subtract 30

  y = 2 . . . . . . . . . . . divide by the coefficient of y

  z = 15 -6(2) = 3 . . . . substitute for y in our equation for z

Substituting these values for y and z into the third original equation gives ...

  x - 2 -3(3) = -10

  x -11 = -10 . . . . . . . . simplify

  x = 1 . . . . . . . . . . . . add 11

The solution to the above system of equations is (x, y, z) = (1, 2, 3).

_____

<em>Comment on the problem statement</em>

Math is generally unforgiving of imprecision. The given system of equations has no variable "z", and some other typos are apparently involved. That is why we rewrote the system to the equations shown above.

It is very easy to mistake z for 2, or g for 9, or o for 0, or 1 for 7. There are other confusions that are possible, as well. Letters I (eye) and l (ell) are easily confused, and may be confused with 1 (one) as well. Sometimes y and 4, or 4 and 9, can also be written so as to be difficult to tell apart. Great care must be taken when handwriting these symbols.

7 0
3 years ago
If the slope of one of these parallel lines is 1.25, the slope of the other line is ___.
oksian1 [2.3K]
1.25 also bc they are parallel
6 0
3 years ago
Answer please answer!!<br> I need the answer asap
PSYCHO15rus [73]

Answer:

35 cm

Step-by-step explanation:

is the correct answer

7 0
2 years ago
What is the value of d?<br><br><br>Round your answer to the nearest tenth.
Sergeeva-Olga [200]

Answer:

11.9 mm

Step-by-step explanation:

We can find d by applying the cosine rules.

d²  = 21² + 27² - 2(21)(27) cos (25)

d²  = 441 + 729 - 1027.75

d²  = 142.25

d = √142.25

d = 11.9 mm (nearest tenth)

5 0
3 years ago
How can I solve that problem
drek231 [11]

<u>What do we know so far</u>:

  • 2\frac{2}{3}laps in \frac{4}{15}hour  ⇒ \frac{8}{3}laps in \frac{4}{15}hour

  *we converted the number of laps into improper fractions

        2\frac{2}{3}  = \frac{8}{3}

<u>We want to know the number of laps in an hour</u>

  ⇒ so we must find the rate which ⇒ lap/hour

   lap/hour =\frac{8/3laps}{4/15hours} =\frac{8}{3}*\frac{15}{4}   =\frac{8}{4} *\frac{15}{3} =2*5=10laps/hour

<u>So William can run</u> ⇒ <u>10 laps in one hour</u>

Hope that helps!

8 0
2 years ago
Other questions:
  • Change the following linear equation in standered form to slope- intercepts form: 2x-y=9
    12·2 answers
  • What is -9x-(2x/-3) When x equals 7
    9·2 answers
  • 35 + 70 = 35(1 + 2)<br> O Yes<br> O No
    14·2 answers
  • Are 20/24,24/28,28/32 equivalent fractions
    13·2 answers
  • Which expression could be modeled by decimal grid?
    13·1 answer
  • What does 1/5 equal as an Decimal
    8·1 answer
  • a truck delivers bags of apples and oranges to the grocery store. Each bag has twice as many apples as oranges. Each bag contain
    15·1 answer
  • Square root of 9 I'll mark the 1st​
    10·1 answer
  • What is the product of -12 and -4?<br> -48<br> -16<br> 16<br> 48
    14·2 answers
  • 8/7 ÷ 6/4 <br><br> Solve the problem (Hint: Simplify before you multiply) *
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!