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
Fynjy0 [20]
3 years ago
8

Use the substitution method to solve the system of equations

Mathematics
1 answer:
Sergeeva-Olga [200]3 years ago
8 0

Answer:

x=1/4

y = -2

(1/4, -2)

b

Step-by-step explanation:

4x -y =3

y =-8x

substitute y =-8x into the first equation.  Everywhere you see y put 8x

4x -y =3

4x - (-8x) =3

4x+8x=3

combine like terms

12x = 3

divide by 12

12x/12x = 3 /12

x = 1/4

now we need to find y

y = -8x

y = -8 * 1/4

y = -2

You might be interested in
Which criterion can be used to prove ABC and ADC are congruent?
olya-2409 [2.1K]
Triangles have common side AC, and 2 adjacent to this side corresponding angles.
∠BAC=∠DCA, and
∠ACB=∠SAD.
So, triangles <span>ABC and ADC are congruent by ASA.</span>
8 0
3 years ago
Is, “What is your favorite color?” A statistical question? Why or why not?
nignag [31]

Answer:

This is a statistical question because to answer this question, you would collect data by asking students about their favorite colors, and there would be variability in the data. The favorite color would not be the same for every student

Step-by-step explanation:

4 0
2 years ago
Two planes left simultaneously from the same airport and headed in the same direction towards another airport 3600 km away. The
ExtremeBDS [4]

Answer:

  • 800 kph
  • 600 kph

Step-by-step explanation:

<u>Equation</u>

Let s represent the speed of the faster plane. Then its travel time is ...

  time = distance/speed = 3600/s

travel time for the slower plane is ...

  time = distance/speed = 3600/(s -200)

The difference in these times is 1.5 hours, so we have ...

  3600/(s -200) -3600/s = 1.5

<u>Solution</u>

Multiplying by (2/3)s(s -200), we get ...

  2400(s) -2400(s -200) = s(s -200)

  s^2 -200s -480000 = 0 . . . . . . . . . . rewrite in standard form

  (s -800)(s +600) = 0 . . . . . . . . . . . . . factor

The positive value of s that makes a factor zero is s = 800.

<u>Conclusion</u>

The speed of the faster plane was 800 km/h; of the slower plane, 600 km/h.

_____

<em>Check</em>

The travel time for the faster plane was 3600/800 = 4.5 hours. For the slower plane, 3600/600 = 6 hours, a difference of 1.5 hours.

6 0
3 years ago
How can i find values if h(-4) h(x)=1/2x-1???
anzhelika [568]

plug in -4 in for x. then solve.

h(-4)=1/2(-4)-1

h(-4)= -3

6 0
3 years ago
There are five boys and three girls in a swimming pool. If two people are selected at
Vlada [557]

Answer:

its a 3/8 chance that there are girls

Step-by-step explanation:

3 0
3 years ago
Other questions:
  • How do I find the area of a triangle with a base of 3 and height of 6
    10·1 answer
  • You roll two dice. Let event A be "The first die shows a 2,a 3, or a 5" and event B be "The second die shows an odd number." Wha
    14·2 answers
  • Write an algebraic expression to represent the number of pens that can be bought with 30 cents if each pen costs c cents
    8·1 answer
  • The cost of grapes is $2.50 per pound. You
    7·2 answers
  • Write each polynomial in standard form. identify the leading coefficient.
    15·1 answer
  • The table shows a gophers scores for four rounds of a recent US women's open her total score was even with par what was her scor
    6·1 answer
  • Write 1.653 x 10-4 as an ordinary number.
    14·2 answers
  • Complete the recursive and explicit formulas for the geometric sequence.
    7·1 answer
  • Which number best represents the location of point A on the number line shown?
    6·1 answer
  • it's not homework but can someone tell me if this printer is only for photos or it's just a normal printer​
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!