Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 381350: how can i graph the system of 2x-2y=-4 and 4x-4y=2 and describe its solution?
Click here to see answer by stanbon(75887)

Question 381352: Could someone please help? I need to graph a system of linear inequalities, then test to see what satisfies both. Here is the system:

x+y>4
x+y<-1
Here's what I have done so far:
For Line 1, the first inequality:
x-intercept is (4,0) and y-intercept is (0,4)
For Line 2, the second inequality:
x-intercept is (-1,0) and y-intercept is (0,-1).
Ok, both these lines are dashed lines, since neither are equal, and therefore included, so I end up with two parallel dashed lines. My problem: I can't find an answer to satisfy BOTH inequalities, so I don't know what to shade in as "true".
Can someone please set me straight and tell me what I am doing wrong? Thank you!!!
Click here to see answer by jim_thompson5910(35256)

Question 381526: Can you please help me with this problem step by step

For y: 3(x + y)= 2y + 1
Click here to see answer by ewatrrr(24785)

Question 381756: hello. can you please help me with this problem? Each price covers th ost of the dinner dce under certain conditions. Pan for between 200 and 300 people, th is, x>200 and x<300.
Click here to see answer by stanbon(75887)

Question 381829: How can i graph on a coordinate plane
3x+2y=-6
Click here to see answer by Alan3354(69443)

Question 381945: write in standard form y=3/4x+6
Click here to see answer by mananth(16946)

Question 381954: Okay
well i have to make a word problem for
this equation.
2x+y=5
7x+4y=15
I solved both by subsutution and elmination
My answers were x=5 y=-5
But i don't know how i can make a word problem with a negative number
I really need help.
Please and Thank you for you time(:
Click here to see answer by mananth(16946)

Question 382073: please help me solve the system of linear equations
x-y=3
2x-2y=6
Click here to see answer by stanbon(75887)

Question 382113: write the equation y= x-4 in standard form (Ax+By=C)
Click here to see answer by user_dude2008(1862)

Question 382112: Does the set of ordered pairs satisfy a linear function? set: {(1,8) , (2,6), (3,4) (4,2), (5,0)} Why is it a linear function?
Click here to see answer by user_dude2008(1862)

Question 382185: 2x-3=y Plot the graph of the equation. Use the "X' and "Y" intercept method to plot the graph. show all work. a checkpoint is not required. Please help me understand this I have tried subtracting 3 from each side to get answer but I must be doing something wrong.
Click here to see answer by stanbon(75887)

Question 382470: i need to know how to do somethings such as i have an 85% alcohol solution and a 50%alcohol solution and i need a 65% solution. and i need 55 liters all together. how many liters of each do i need? i have the eqautions
x=how many liters of 85%
y=how many liters of 50%
i have x+y=55 (liters)
and i have .85x+.50y= .65
please reply as soon as possible, thank you
Click here to see answer by stanbon(75887)

Question 382522: y=3x+1; y=5x-3x how do I substitute
Click here to see answer by stanbon(75887)

Question 382712: solve 7^2x+5=37 for x
Click here to see answer by Fombitz(32388)

Question 382807: Write an equation of the line containing the given point and parallel of the given line. Express your answer in the form y=mx+b
(5,-7); 7x+2y=3
Click here to see answer by mananth(16946)

Question 382786: {x^2-3y^2=-1
{2x^2-7y^2=-5
Click here to see answer by Fombitz(32388)

Question 382928: solve the system algebraically y=6x-28 and y=4x-16
Click here to see answer by Fombitz(32388)

Question 383053: solve for x and y.
3x-y=-15
4x+5y=-1
Click here to see answer by Fombitz(32388)

Question 383235: how do i graph the equation -x + 2y =4
Click here to see answer by Alan3354(69443)

Question 383235: how do i graph the equation -x + 2y =4
Click here to see answer by stanbon(75887)

Question 382714: Dr. W jogs east at 5.5mph. Thirty minutes later (1/2 hr), Mrs. Dr.W jogs west at 7.25mph. When will they be 25 miles apart?
Click here to see answer by ankor@dixie-net.com(22740)

Question 383489:
Click here to see answer by robertb(5830)

Question 383391: how do you solve
2x+3y=1
-x+1/3y=5
Click here to see answer by Fombitz(32388)

Question 383540: Type an equation for g(x) that results with f(x), in an inconsistent system:
f(x)=8x-1
g(x)=
how else can you describe the two lines in this inconsistent system?
Click here to see answer by Fombitz(32388)

Question 383639: x=6y-4 and x=-2y+28
Click here to see answer by Fombitz(32388)

Question 383597: solve the system by the substitution method
x-2y=-3
y=-4x+24
Click here to see answer by Fombitz(32388)

Question 383804: how do you write x+3y=9 in function form.
Click here to see answer by solver91311(24713)

Question 383893: -12>=t-17
Click here to see answer by rfer(16322)

Question 383962: Hey i'm having some trouble in math so I would like some help from you guys (:
Which of the following equations represents a line perpendicular to the line y-2x=5

options are
A. x - 1/2y =-10
B. x + 1/2y=10
C. X+2y=10
D -x+2y=10
Click here to see answer by mananth(16946)

Question 383987: Use substitution to find all solutions to the system of equations
y=x^2
y=x+12

Click here to see answer by Fombitz(32388)

Question 384111: x +1/ 12 = 3/20 answer is -41/5 please help need a break down of why the answer is -41/5
Click here to see answer by Fombitz(32388)

Question 384111: x +1/ 12 = 3/20 answer is -41/5 please help need a break down of why the answer is -41/5
Click here to see answer by ewatrrr(24785)

Question 384192: Solve the following systems of two linear equations.
2x+4y =18
x+2y =13
Click here to see answer by ewatrrr(24785)

Question 384194: Solve the following systems of two linear equations.
4x-2y =2
-2x+y =-1
Click here to see answer by ewatrrr(24785)

Question 384194: Solve the following systems of two linear equations.
4x-2y =2
-2x+y =-1
Click here to see answer by stanbon(75887)

Question 384329: 15y=6+15x
15x-20y=-7

I really need help and step by step instructions thank you. I need it by the 14th please!!
Click here to see answer by jim_thompson5910(35256)

Question 384464: My son (14) says there is no solution to his homework question, is he correct

(w+x)(y+z)
w*y=4
x*z= -15
(w*z)+(x*Y)=1

Click here to see answer by stanbon(75887)

Question 384733: Hello again, I wonder if you can help me with these word problems?
Suppose that x liters of a 31% acid solution are mixed with y liters of a 44% solution to obtain 100 L of a 36% solution. One equation in a system is x+y=100 what is the second equation?

Bay City and Vernonville are 176 miles apart. A car leaves Bay City traveling towards Vernonville, and another car leaves Vernonville at the same time, traveling towards Bay City. The car leaving Bay City averages 10 miles per hour more than the other, and they meet after 1 hour and 36 minutes. What are the average speeds of the cars?
I got: Bay City 60 and Vernonville 50
I really need these by the 14th!!! Thank you fro all of your help!

Click here to see answer by Alan3354(69443)

Question 384738: I need help with these word problems by the 14th please HELP!!!
At the beginning of a walk, Roberto and Juanita are 3.3 miles apart. If they leave at the same time and walk in the same direction, Roberto overtakes Juanita in 11 hours. If they meet in 1 hour what are their speeds?
I got 3.3x+3.3y=11, am I on the right path? and where do I go from here?
If a plane can travel 480 miles per hour with the wind and 440 miles per hour against the wind, find the speed of the plane in still air.
Click here to see answer by Alan3354(69443)

Question 384973: 3x+2y=4 how do you find the slope
Click here to see answer by rfer(16322)

Question 385069: How can I write a system of equations for this problem:
120 people attended a musical. The total amount of money collected for tickets is $1515. Prices are $15 for adults, $12 for kids, and $10 for seniors. Twice as many child's tickets were sold as adult tickets. Write a system of equations to find the number of adult, child, and senior tickets were sold. The solve the system by using a matrix equation and the inverse equation.
so far i have x+y+z=120 and 12x+15y+10z=1515
y is adult
x is adult
z is senior
Click here to see answer by tara0066(31)

Question 385122: How to solve:
1/4 (w+2) = 1/6 (5-w)
Click here to see answer by rfer(16322)

Question 385212: Can I please get some assistance for this problem? Thank you.
Solve the following system of three linear eqations.
2x+3y+7y=13
3x+2y-5x=-22
5x+7y-3z=-28
Click here to see answer by Edwin McCravy(20056)

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