Mathematics, 27.01.2020 08:31 zayrasanatana13

Can someone answer these for me? ill give brainliest, i really need to finish : (
(substitution method)

1) -8x+2y=-4
y=-3x-2

2) 12x-3y=4
y=4x

3) 3x+2y=11
x+2y=9

4) -3+2y=5
-4x+y=10

Answers: 2

Show answers

Answers

Answer from: hokamidat

Step-by-step explanation:

-8x + 2y = -4 12x - 3y = 4

y = -3x - 2 y = 4x

sub sub

-8x + 2(-3x - 2) = -4 12x - 3(4x) = 4

-8x - 6x - 4 = -4 12x - 12x = 4

-14x = -4 + 4 0 = 4

-14x = 0 NO SOLUTION

x = 0

y = -3x - 2 -3 + 2y = 5

y = -3(0) - 2 -4x + y = 10...y = 4x + 10

y = -2 sub

solution is : (0,-2) -3 + 2(4x + 10) = 5

-3 + 8x + 20 = 5

3x + 2y = 11 8x + 17 = 5

x + 2y = 9...x = 9 - 2y 8x = 5 - 17

sub 8x = - 12

3(9 - 2y) + 2y = 11 x = -12/8

27 - 6y + 2y = 11 x = -3/2

-4y = 11 - 27

-4y = -16 y = 4x + 10

y = -16/-4 y = 4(-3/2) + 10

y = 4 y = -12/2 + 10

y = -6 + 10

x = 9 - 2y y = 4

x - 9 - 2(4) solution (-3/2,4)

x = 9 - 8

x = 1

solution : (1,4)

Answer from: Quest

function 2 has a greater rate of change than function 1

function 2 has a greater y-intercept than function 1

step-by-step explanation:

$\newline{\text{the rate of change is change per unit time}}$ $\newline{\text{for (x,y), rate of change is }\frac{y_2-y_1}{x_2-x_1} \text{ or change in y divided by change in x}}$ $\newline{\text{for function 1, the cost goes up by 75-45=30 each time every hour}}$ $\newline{\text{that means that the slope of function 1 is 30 per hour}}$ $\newline{\text{for the 2nd function, 40 is added every hour. therefor, the slope is 40 per hour}}$ $\bigskip\newline{\text{since 40 per hour> 30 per hour, function 2 has a greater rate of change than function 1}}$ $\bigskip\newline{\text{the y intercept is the y value when x is 0}}$ $\newline{\text{for function 1, the y value when x is 0 is 45}}$ $\newline{\text{for function 2, the y value when x is 0 (or the flat rate) is 50}}$ $\newline{\text{since 50> 45, function 2 has a greater y intercept than funciton 1}}$ $\bigskip\bigskip\newline{\text{the answers are: }}$ $\newline{\text{ function 2 has a greater rate of change than function 1}}$ $\newline{\text{function 2 has a greater y-intercept than function 1.}}$

Answer from: Quest

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.

Afive question multiple-choice quiz has five choices for each answer. use the random number table pr

Another question on Mathematics

Mathematics, 21.06.2019 13:30

Which of the following lines is not parallel to the graph of y = 4x +7?

Answers: 1

Answer

Mathematics, 21.06.2019 15:30

The local farm is advertising a special on fresh picked peaches. the farm charges $4.25 to pick your own peck of peaches and $3.50 for each additional peck you pick. write an equation for the total cost of peaches in terms of the number of pecks. deine your variables. how much does it cost to pick 3 pecks of peaches?

Answers: 3

Answer

Mathematics, 21.06.2019 18:30

What is the value of x in the following equation? -3x-2=2x+8

Answers: 1

Answer

Mathematics, 21.06.2019 19:30

Ineed with this problem 21 show steps

Answers: 2

Answer

You know the right answer?

Can someone answer these for me? ill give brainliest, i really need to finish : (
(substitut...