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
ch4aika [34]
2 years ago
8

13. Describe the system by substitution: y=x-7 2x - y = 3

Mathematics
1 answer:
torisob [31]2 years ago
4 0

Answer:

x = y + 7 \\  \\ x =  \frac{3 + y}{2}  \: or \: y = 2x - 3

Step-by-step explanation:

1. \: 2x = 3 + y \\ 2. \: x =  \frac{3 + y}{2}  \: or \: y = 2x - 3 \\  \\ 1. \: y + 7 = x \\ 2. \: x = y + 7

You might be interested in
For an acute angle θ, the equation sin (θ) = cos (7°)is true. What is the value of θ?
8_murik_8 [283]

Answer:

  θ = 83°

Step-by-step explanation:

For acute angles, the sine of an angle is the cosine of its complement, and vice versa.

__

  sin(θ) = cos(90° -θ) . . . . relation between sine and cosine

  sin(θ) = cos(7°) . . . . . . . . given

  90° -θ = 7° . . . . . . . . . matching arguments of cos( )

  θ = 83° . . . . . . . . . add θ -7° to both sides

5 0
2 years ago
Given that (-4,-4) is on the graph of f(x), find the corresponding point for the function 1/2 f(x)
marusya05 [52]

Answer:

(-4, -2)

Step-by-step explanation:

The x-coordinate would stay the same, but the y-coordinate would be halved.  Thus, the corresponding point would be (-4, -2).

3 0
3 years ago
Of the 180 students in Mrs. Stanfield's class,
Nesterboy [21]

Answer:

should be 27

Step-by-step explanation:

60% of 180 is 108

25% of 108 is 27

5 0
2 years ago
Read 2 more answers
Kindlyy solve this question..
Bas_tet [7]

Answer:

Volume = 21688.37 in.³

Step-by-step explanation:

Volume of a sphere : V=4/3πr³

4/3π17.3³ ≈ 21688.37025

hope this helps :D

3 0
3 years ago
Use your understanding of the unit circle and trigonometric functions to find the values requested.
vfiekz [6]

Answer:

a) For this case we can use the fact that sin (\pi/3) = \frac{\sqrt{3}}{2}

And for this case since we ar einterested on -\frac{\pi}{3} and we know that the if we are below the y axis the sine would be negative then:

sin (-\pi/3) = -\frac{\sqrt{3}}{2}

b) From definition we can use the fact that tan x= \frac{sin x}{cos x} and we got this:

tan (5\pi/4) = \frac{sin(5\pi/4)}{cos(5\pi/4)}

We can use the notabl angle \pi/4 and we know that :

sin (\pi/4) = cos(\pi/4) = \frac{\sqrt{2}}{2}

Then we know that 5\pi/4 correspond to 225 degrees and that correspond to the III quadrant, and we know that the sine and cosine are negative on this quadrant. So then we have this:

tan (5\pi/4) = \frac{sin(5\pi/4)}{cos(5\pi/4)}= \frac{\frac{sqrt{2}}{2}}{\frac{\sqrt{2}}{2}} = 1

Step-by-step explanation:

For this case we can use the notable angls given on the picture attached.

Part a

For this case we can use the fact that sin (\pi/3) = \frac{\sqrt{3}}{2}

And for this case since we ar einterested on -\frac{\pi}{3} and we know that the if we are below the y axis the sine would be negative then:

sin (-\pi/3) = -\frac{\sqrt{3}}{2}

Part b

From definition we can use the fact that tan x= \frac{sin x}{cos x} and we got this:

tan (5\pi/4) = \frac{sin(5\pi/4)}{cos(5\pi/4)}

We can use the notabl angle \pi/4 and we know that :

sin (\pi/4) = cos(\pi/4) = \frac{\sqrt{2}}{2}

Then we know that 5\pi/4 correspond to 225 degrees and that correspond to the III quadrant, and we know that the sine and cosine are negative on this quadrant. So then we have this:

tan (5\pi/4) = \frac{sin(5\pi/4)}{cos(5\pi/4)}= \frac{\frac{\sqrt{2}}{2}}{\frac{\sqrt{2}}{2}} = 1

6 0
3 years ago
Other questions:
  • Which expression is equivalent to t^2-36
    6·1 answer
  • Please help me!!!!!!!
    14·1 answer
  • Which of the following is the inverse of y=6^x?
    7·2 answers
  • Which linear inequality is represented by the graph?
    8·1 answer
  • Grass can grow up to 6in tell in a week depending on temperature, humidity, and time of year. At this rate, how tall will grass
    10·1 answer
  • Biking at 8 mph, it takes Kristen 1/4 hour to reach the train station to go to work. Kristen then takes the train to work, and i
    8·1 answer
  • Factor completely.
    15·1 answer
  • What is the value of 7742
    10·1 answer
  • Which answer choice correctly identifies the relevant information in the
    15·1 answer
  • For this Discussion, follow these three steps:
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!