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4 years ago

Please heeeeeelp meeeee

Mathematics

1 answer:

Pepsi [2]4 years ago

5 0

Answer:

1) C

2)C

3)C

Step-by-step explanation:

in y=mx+b the

m is the slope, b is the y-intercept

y is the output, x is the input

1) The slope is -2 and y-intercept is 3

so y= -2x+3 which is C

2) Slope:6/5 and y-intercept is -4

so y= 6/5x-4 which is C

3) Slope: -1 and y-intercept is 2

You don't put 1x or -1x it's just x.

so y= -x+2 which is A

Hope this helps:)

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Cot^2x-csc^2x=-1 for all values of x true or falsse

Leno4ka [110]

Our basis for this equality is the pythagorean theorems of trigonometry. There are three equations for the pythagorean theorems. These are:

sin²x + cos²x =1
1 + tan²x = sec² x
1 + cot² x = csc² x

These are all derived from circle geometry on the cartesian plane. Now, the useful trigonometric property to be used is the third one. Rearranging this, we come up with

cot²x - csc²x = -1

This coincided with the given equation. Therefore, this is true. This is because it is already established from the pythagorean theorems.

4 0

3 years ago

Read 2 more answers

A coin bank for donations for the protection of the reef contained Php 1,570. There were twice as many Php 5-coins as

kvasek [131]

Answer:

There are 144 Php 5-coins, 72 Php 10-coins and 130 Php-1 coins

Step-by-step explanation:

The amount of the coins in the coin bank = Php 1,570

The number of Php 5-coins = 2 × The number of Php 10-coins

The number of Php 5 coins = The number of Php 1-coins + 14

Let 'x' represent the number of Php-5 coins, let 'y' represent the number of Php 10-coins, and let 'z' represent the number of Php 1-coins, we get;

x = 2 × y...(1)

x = z + 14...(2)

5·x + 10·y + z = 1,570...(3)

From equation (1) equation (2), and equation three, we have;

y = x/2

z = x - 14

5·x + 10·x/2 + x - 14 = 1,570

11·x - 14 = 1,570

x = (1,570 + 14)/11 = 144

The number of Php 5-coins, x = 144

y = x/2

∴ y = 144/2 = 72

The number of Php 10-coins, y = 72

z = x - 14

∴ z = 144 - 14 = 130

The number of Php 1-coins, z = 130

6 0

3 years ago

I need math help please

poizon [28]

Answer:

n+11=15

-11 -11

n=4

Step-by-step explanation:

subtract 11 from both sides

5 0

4 years ago

Read 2 more answers

WILL GIVE BRAINLY Find the perimeter of the figure below, in meters.

yan [13]

Answer:

$147.6\:\mathrm$

Step-by-step explanation:

The perimeter of a polygon is simply sum of the lengths of all sides of the polygon.

Therefore, we can find this polygon's perimeter by adding up the length of each of its sides:

$9.8+9.8+11.7+9.8+21.5+21+11.7+9.8+31.3+11.2=\boxed{147.6\:\mathrm{m}}$

Since there is a lot to keep track of, I'd recommend picking any side and moving clockwise/counter-clockwise until you get all sides.

3 0

3 years ago

What is the solution of the system X - 3y = -13 and 5x + 7y = 34

hammer [34]

Answer:

The solution for this system is x = 1/2 and y = 9/2

Step-by-step explanation:

1. We have this system of equations:

x - 3y = -13 and 5x + 7y = 34

2. Let's try to find out the value of x on the first equation:

x - 3y = - 13

x = 3y - 13

3. Now, let's replace x on the second equation for finding y:

5x + 7y = 34

5 (3y - 13) + 7y = 34

15y - 65 + 7y = 34

22y = 34 +65

22y = 99

2y = 9 (Dividing by 11 at both sides)

y = 9/2 (Diving by 2 at both sides)

4. Now, let's find out the value of x on the first equation, using the value of y:

x - 3y = - 13

x - 3 (9/2) = - 13

x - 27/2 = -13

x = -13 + 27/2

x = (-26 + 27)/2 (Adding - 13 and 27/2)

x = 1/2

5. Finally, let's prove the values of x and y are correct on the second equation of the system:

5x + 7y = 34

5 (1/2) + 7 (9/2) = 34

5/2 + 63/2 = 34

(5 + 63)/2 = 34

68/2 = 34

34 = 34

It has been proved that x = 1/2 and y = 9/2 are correct

5 0

3 years ago