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Mademuasel [1]
2 years ago
15

Find an ordered pair (x,y) that is a solution to the equation. x-3y=9 (x,y)= ?

Mathematics
1 answer:
Gemiola [76]2 years ago
7 0

Answer:

(9,-3)

Step-by-step explanation:

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PLZ HELP !!! THIS TEST IS VERY IMPORTANT!!!!
andrew11 [14]

Answer:

E=20H

Step-by-step explanation:

E =20 when H=1

there fore the amount he receives per working time will be 20*H

8 0
3 years ago
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I'd really appreciate some help on these questions, I'm really struggling
nikklg [1K]
We can use linear combinations of the equations to eliminate variables.

3x - 4y = 1
-2x + 3y = 1

To eliminate y we'll make the linear combination of 3 times the first equation minus four times the second. 

9x - 12y = 3
-8x + 12y = 4

Adding,
x = 7

We could solve for y directly but let's use another linear combination, twice the first plus three times the second:

2(3x - 4y) + 3(-2x + 3y)= 2(1)+3(1)

y = 5

Check: 3(7)-4(5)=1 good.   -2(7)+3(5)=1 good.

Q18 Answer: (7,5)

y = -3x + 5
5x - 4y = -3

4y +1(5x - 4y) = 4(-3x + 5) + 1(-3)

5x = -12x + 20 -3

17 x = 17

x = 1
y = -3(1) + 5 = 2
Check: 5(1) - 4(2) = -3 good

Q19 Answer (1,2)

6x + 5y = 25
x = 2y + 24
6x = 12y + 144
5y = 25 - 12y - 144
17y = -119
y = -119/17= -7
x = 2y+24= 10
Check: 6(10)+5(-7)=25 good   2y+24=2(-7)+24=10=x good

Q20 Answer (10,-7)


3x + y = 18
-7x + 3y = -10
9x  + 3y = 54
9x - -7x = 54 - -10
16x = 64
x=4
y = 18 -3x = 18-12=6

Check: 3(4)+6=18 good,  -7(4)+3(6)=-10 good

Q21 Answer: (4,6)

6 0
3 years ago
A group of 4 friends likes to golf together, and each friend keeps track of her all-time lowest score in a single round. Their l
ale4655 [162]
To find the median you list out all the numbers and find the middle.

80, 90, 100

With angie getting 75, it goes from "80, 90, 100" to "75, 80, 90, 100"

This changes the median from 90 to 85. 

Mean is the average of all the numbers. The average of the first set of numbers (Found by adding all of the numbers up and dividing by the amount of numbers present) is 90.

The mean of the second set is 86.25

The answer would be A, both the mean and median will decrease.
5 0
3 years ago
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Could someone pleaseeeeeee help?
exis [7]
The third choice is the answer
7 0
3 years ago
Read 2 more answers
Find an inverse of 16 modulo 17. That is solve 16x=1(mod 17)
mote1985 [20]

Answer:

-1 is the inverse of 16 modulo 17.

Step-by-step explanation:

To find : An inverse of  16 modulo 17 i.e. 16x=1(mod 17)?

Solution :

First we find the GCD of (17,16) using Euclid's algorithm,

17=16\times 1+1

Remainder is 1.

Which means, GCD(17,16)=1

Using back substitution we get,

1=17-16(1)

\Rightarrow 16(-1)=1+17(-1)

\Rightarrow 16(-1)=1(\mod 17)

i.e. -1 is the inverse of 16 modulo 17.

On comparing with 16x=1(mod 17)

The value of x=-1.

5 0
3 years ago
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