Mathematics, 29.12.2019 02:31 avaleasim

1. solve the system by graphing.
{ -2x = 2y - 4
{ 2x - y = -5

2. without graphing, is the system independent, dependent, inconsistent?
{ y = 2x - 8
{ 2x - y = 8

a. dependent
b. independent
c. inconsistent

3. what is the solution of the following system?
{ -2x - y = 1
{ -4x - 2y = -1

a. infinitely many solutions
b. no solution
c. (3,8)
d. (-3,-8)

4. solve the system of inequalities by graphing.
{ y is less than or equal to -4x - 1
{ y > 3x - 1

5. your club is baking strawberry and apple pies for a bake sale. they need at most 18 pies, and cannot have more than 12 apple pies. write and graph a system of inequalities to model this system.

a. let x = the number of strawberry pies. let y = the number of apples pies
{ x is more than or equal to 0
{ y is more than or equal to 0
{ x + y is more than or equal to 18
{ y is less than or equal to 12

b. { x is more than or equal to 0
{ y is more than or equal to 0
{ x + y is less than or equal to 18
{ y is less than or equal to 12

c. { x is more than or equal to 0
{ y is more than or equal to 0
{ x + y is less than or equal to 18
{ y is more than or equal to 12

d. { x is more than or equal to 0
{ y is more than or equal to 0
{ x + y is more than or equal to 18
{ y is more than or equal to 12

6. a rental car agency charges a flat fee of $110.00 plus $46.00 per day to rent a certain car. another agency charges a fee of $70.00 plus $54.00 per day to rent the same car.
using a graphing calculator, to find the number of days for which the costs are the same. round your answer to the nearest whole day.

7. solve the system by substitution.
{ -4.5x - 2y = -12.5
{ 3.25x - y = -0.75

8. solve the system using elimination.
{ 5x + 4y = 12
{ 3x - 3y = 18

9. the length of a rectangle is 9.7 cm more than 4 times the width. if the perimeter of the rectangle is 91.4 cm, what are it's dimensions?

Answers: 3

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Answers

See attached picture for the answers:

1. solve the system by graphing. { -2x = 2y - 4 { 2x - y = -5 2. without graphing, is the system i

Answer from: jacobdismuke5093

Part 1) Solve the system by graphing.

we have

$-2x = 2y - 4\\2x - y = -5$

using a graph tool

see the attached figure N 1

the solution is the point (-1,3)

therefore

the answer part 1) is

(-1,3)

Part 2) Without graphing, is the system independent, dependent, inconsistent? y =2x-8 -------> equation

2x - y=8 -------> equation

Multiply equation by

-y =-2x+8 -------> 2x-y=8

equation is equal to equation

therefore

The system has no solution, is a inconsistent system

the answer part 2) is the option

C. Inconsistent

Part 3) What is the solution of the following system?

$-2x - y = 1 \\-4x - 2y =-1$

the lines are parallel

The system has an infinite number of solutions, it is dependent

therefore

the answer Part 3) is the option

A. Infinitely many solutions

Part 4) Solve the system of inequalities by graphing.

$y \leq-4x - 1\\y 3x - 1$

using a graph tool

see the attached figure N 2

The solution is the shaded area

therefore

the answer part 4) in the attached figure N 2

Part 5) Your club is baking strawberry and apple pies for a bake sale. They need at most 18 pies, and cannot have more than 12 apple pies. Write and graph a system of inequalities to model this system

Let

x -------> the number of strawberry pies

y -------> the number of apples pies

we know that

$x+y\leq 18$

$y\leq12$

using a graph tool

see the attached figure N 3

the solution is the shaded area

therefore

the answer Part 5) is the option

B. { x is more than or equal to 0

{ y is more than or equal to 0

{ x + y is less than or equal to 18

{ y is less than or equal to 12

Part 6) A rental car agency charges a flat fee of $110.00 plus $46.00 per day to rent a certain car. Another agency charges a fee of $70.00 plus $54.00 per day to rent the same car.

Using a graphing calculator, to find the number of days for which the costs are the same. Round your answer to the nearest whole day

Let

x-------> the number of days

y-------> total cost to rent a car

we know that

First agency

y=110+46x --------> equation

Second agency

y=70+54x --------> equation

to find the number of days for which the costs are the same solve the system of equations

the intersection both graphs is the solution

using a graph tool

see the attached figure N 4

the solution is the point (5,340)

therefore

the answer is

$5\ days$

Part 7) Solve the system by substitution.

-4.5x-2y =-12.5 --------> equation

3.25x- y=-0.75

y=3.25x+0.75 --------> equation

Substitute equation in equation

-4.5x-2*[3.25x+0.75]=-12.5

-4.5x-6.50x-1.50=-12.5

-11x=-12.5+1.50

-11x=-11

x=1

find the value of y

y=3.25*1+0.75

y=4

therefore

the answer part 7) is

the solution is the point (1,4)

Part 8) Solve the system using elimination.

5x+4y=12 ------> equation

3x-3y=18 ------> equation

Multiply equation by

15x+12y=36 ------> equation

Multiply equation by

12x-12y=72 ------> equation

Add equation and equation

$15x+12y=36\\12x-12y=72\\-------\\27x+0y=108\\x=108/27\\ x= 4$

Find the value of y

5*4+4y=12

4y=12-20

y=-8/4

y=-2

therefore

the answer Part 8) is

the solution is the point (4,-2)

Part 9) The length of a rectangle is 9.7 cm more than 4 times the width. If the perimeter of the rectangle is 91.4 cm, what are it's dimensions?

Let

x-------> the length of the rectangle

y-------> the width of the rectangle

we know that

the perimeter of the rectangle is equal to

$P=2x+2y\\ P=91.4\ cm$

2x+2y=91.4

Divide by both sides

x+y=45.7 -------> equation

x=9.7+4y -------> equation

substitute equation in equation

(9.7+4y)+y=45.7

5y=45.7-9.7

5y=36

$y=7.2\ cm$

find the value of x

x=9.7+4*7.2

$x=38.5\ cm$

therefore

the answer part 9) is

the length of the rectangle is $38.5\ cm$

the width of the rectangle is $7.2\ cm$

Answer from: Quest

whatever you can spend with $11.53 or under.

step-by-step explanation:

20 - 8.47 = 11.53. take away the money he used for lunch from the starting amount of 20.

Answer from: Quest

there has been genes found in the x chromosome of males that have been linked to [homo/hetero]sexuality. in addition to the reign of the x chromosome, a section of chromosome 8 has also been link to, "alot of ppl are so " these facts were proven true after a 2014 study of a gay male and his strait brother. according to newscientist.com,"chromosome 14 and is mainly active in the thyroid, but also the brain. called tshr, it makes a type of receptor protein that recognises and binds to a hormone that stimulates the thyroid. in this way, the gene plays an important role in controlling thyroid function. the fact that tshr seems to be involved in sexual orientation fits with evidence that thyroid function seems to be linked to sexuality."

in conclusion, "ppl are so gay" due to their genetics.

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You know the right answer?

1. solve the system by graphing.
{ -2x = 2y - 4
{ 2x - y = -5

2. without g...