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

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Question 183507: Solving a system of four equations:
3a+2b+c-d=-5
2a-5b+8c+2d=19
7a+12b-3c=-5
11a-7b=18
Click here to see answer by Alan3354(69443)

Question 184062: I am not exactly sure if this is a linear equation but I need help!!!
I am homeschooled and I dont understand one of the problems in my book- I would send you the ISBN # but my book doesnt have one I guess.
The section is called " Uniting Literal Coefficients by Using Parentheses"
I dont understand how to do it and like in this problem- the directions say to subtract the lower expression from the upper one-
dy+az
ey-bz

that is just a sample problem another one is-
ax+aby
bx+aby

Please HELP me- Thank you so much- if you need any more info, please just ask.
Click here to see answer by solver91311(24713)

Question 184141: Solve each system using the specified method. Substitution
4x-3y=15
x-2y=0
Click here to see answer by jim_thompson5910(35256)

Question 184227: A student walks and jogs to college each day. She averages 5 km/h walking and 9km/h jogging. The distance from home to college is 8 km, and she makes the trip in 1 hr. How far does the student jog?
Click here to see answer by stanbon(75887)

Question 184212: During a work-out session, Mark either ran at a speed of 7MPH or walked at a speed of 3MPH. He completed 20 miles in 3 hours. Please help me.
1. Let r represent the number of miles Mark ran and w respresent the number of miles Mark walked. Write a system of equations that represents the situation.
2.Solve the system of equations to find how much time Mark spent running.

Click here to see answer by scott8148(6628)

Question 184216: The manager of a movie theater found that Staurday's sales were $3675. He knew that a total of 650 tickets were sold Satueday. Adult tickets cost $7.50, and children's tickets cost $4.50.
1. Write equtions to represent the number of tickets sold and the amount of money collected.
2. How many of each kind if ticket were sold?
Click here to see answer by checkley77(12844)

Question 184303: Please Help:
My question is on Graphing a System of Linear Equations.
The system is:
x + y =6
2y - x = 18
According to my book, The equation x + y = 6 passes through (6,0) and (0,6)
The equation 2y - x = 18 passes through (-18,0) and (0,9)
What I am confused about is how did they come up with -18 for the second equation where they stated that the equation 2y - x = 18 passes through (-18,0) and (0,9)?
I need to know how to get these points with the Graphical Solution Method.
Thank You
Click here to see answer by solver91311(24713)

Question 184418: how do you change a equation from standard to slope-intercept form
Click here to see answer by Edwin McCravy(20056)

Question 184388: `please help me solve each system of equation
1.) x-2y=-14 2.) x+2y=4 3.) 3x-y=2
y+2x=4 2x+y=-1 y=2x-5
and whats the solution??'
Can you help me solve all of them is because i am bad at math ={ Thank You I would really appreciate it
Click here to see answer by checkley77(12844)

Question 184380: 1/5x + 3/2 = 3/10
Would I find the common denominator for 1/5x and 3/2, which should be 10? Then do the recipocal of 3/2 to 2/3 and then subtract 3/10-2/3?
Click here to see answer by checkley77(12844)

Question 184553: Determine whether the given ordered pair is a solution of the system of equation. Remember to use alphabetical ordered varibles. (9,1);
8x-y=71
3x-4y=23
Is the ordered pair a solution? No or yes
Click here to see answer by checkley77(12844)

Question 184539: Solve the linear system by using the method of your choice.
1.8x+3y=3
-2x-2.5y=-5

please tell me which choice you chose, and please explain the steps as best as you can. Thank you!
Click here to see answer by checkley77(12844)

Question 184587: Solve the system of equations by graphing
x+y=8
x-y=-6
What is the solution of the system of equations?
Click here to see answer by vleith(2983)

Question 184629: I need help to solve this problem.
Solve the systems of equations by substitutions
5x + y = 9
y=4x Type an ordered pair.
Click here to see answer by solver91311(24713)

Question 184667: How Do I find the determinant?
4 -3
-1 -2
Click here to see answer by nerdybill(7384)

Question 184670: How do i find the determinant?
(2)(-1)(4)
(8)(3)(-5)
(-5)(2)(2)
Click here to see answer by jim_thompson5910(35256)

Question 184678: Please help me to solve this equation,
Solve the substitution method which is the solution of the system
8x +3y=-22
-3x + y = 21
Type an orderered pair.
Click here to see answer by alaccalac(13)

Question 184718: use elimination method to solve.
-x+6y=-14
3x-6y=14
Click here to see answer by Mathtut(3670)

Question 184758: PLEASE GUIDE ME.
A math class has 30 students . the number of boys in the class is 4 more than the number of girls.\ Use the system of linear equations to determine the number of girls in the class. Show your workPLEASE GOD HELP ME
Click here to see answer by stanbon(75887)

Question 184713: I need help with this problem.
Solve by the elimination method
4x-3y=39
3x+2y=-9
What is the solution of the system
Type an ordered pair
Simplify your answer
Click here to see answer by checkley77(12844)

Question 184836: what is: y= x+7 (eq. 1)
y= -4x-3 (eq. 2)
Click here to see answer by jigs_ipan(5)

Question 184835: what is: y= x+7
y= -4x-3
Click here to see answer by alaccalac(13)

Question 184895: I have a question on how to solve direct variations?
i dont understand how to do y=kx and graph?
Please Help!
Click here to see answer by edjones(8007)

Question 184999: I am given to sets of points (-2,-4) and (2,1). I need to write an equation.
this is what I did:
m= 1- (-4)/2- (-2) = 3/0 = 3
y= 3x + b
-4 = 3(-2) + b
-4 = -6 + b
+6 +6
-2=b ???????
Very Confusing
Click here to see answer by Earlsdon(6294)

Question 185199: 2xsqured-8=0
Click here to see answer by vleith(2983)

Question 185242: Please help me with this problem. My work is due tonight by 11:59p.m.
Solve the system of equations
8x-y+z=34
3x+2y-3z=-15
x-3y+2z=29
Type an exact answer in simplified form. If the answer is the empty set, Type N for each coordinate. If the system is dependant Type D for each coordinate
Click here to see answer by Edwin McCravy(20056)

Question 185288: through -1,6; slope -5/6
Click here to see answer by jojo14344(1513)

Question 185321: Supplementary Angles. Two supplementary angles are such that one is 8 degrees less than three times that other. Find the angles.
Click here to see answer by solver91311(24713)

Question 185313: Solve by the Addition Method:
4x-5y=3y+4
2x+3y=2x+1
Click here to see answer by ankor@dixie-net.com(22740)

Question 185366: How do you solve this algebraic word problem graphically?
Student 1 and Student 2 went shopping at Staples. Student 1 got 2 boxes of pencils and 3 notebooks for 15 dollars. Student 2 got 3 boxes of pencils and 5 notebooks. how much is one box of pencils?
I know how to find the answer algebraically, but the graphing is messing me up. how do you make the linear equation from this???
Click here to see answer by stanbon(75887)

Question 185362: Fearful of bank failure, Norman split his life savings of $60,000 among three banks. He received 5%, 6%, and 7% on three deposits. In the account earning 7% interest, he deposited twice as much as in the account earning 5% interest. If his total earnings were $3,760, then how much did he deposit in each account?
Click here to see answer by stanbon(75887)

Question 185375: Hello my name is Aaliyah and I really need help on this problem.
2x-5y=-158
x-y=-40
But it will not show me how to do it or anything and really need it, because i am a 7th grader and i am really smart but just do not get this problem at all, and my math class is all 9th graders, only me and three other 7th grade girls are in this honorable class. So please help. Thankyou very much!!!!!!!!!!!!!!!
Click here to see answer by nerdybill(7384)

Question 185391: graph linear equation: y=x-2 please
Click here to see answer by vleith(2983)

Question 185456: Think i did them right but 2 & 3 are I get no solution and want to make sure I am not leaving something out.
1. Solve by substitution or elimination method:
3x � 2y = 26
-7x + 3y = -49
2. Solve by substitution or elimination method:
4x � 5y = 14
-12x + 15y = -42
3. Solve by substitution or elimination method:
-2x + 6y = 19
10x � 30y = -15

Click here to see answer by jim_thompson5910(35256)

Question 185460: when solving systems of linear equations I was taught to put it in y=ms+b form.
When graphing the equations I get mixed up as to go up or down or left or right for the lines. Ex: 2x-y = 6 x-y = 5 Am I adding y or subtrating x?
Click here to see answer by checkley77(12844)

Question 185578: y-2x-4
x=1/2y=2
would you help me??
Click here to see answer by stanbon(75887)

Question 185805: solve
x + 40/x = -13
Click here to see answer by checkley77(12844)

Question 185919: no idea where to even start....please help using excel.
Click here to see answer by solver91311(24713)

Question 185915: I need someone to complete the prob using excel, then I can do the other problems assisgned and see if I can use this one as a key to do the others.
Click here to see answer by solver91311(24713)

Question 186085: How do you solve this linear system with substitution?
8x+3y=0
-x-9y=92
All I have got to is...
x=-9y-92
3y(-9y-92)=0
-6y-92=0
-6y=92
I dont think I did it right??
Click here to see answer by josmiceli(19441)

Question 186063: Write an equation in slope-intercept form of the line satisfying the given conditions. The line passes through (2,4) and has the same y-intercept as the line whose equation is x - 4y = 8
Click here to see answer by hkelson(7)

Question 186082: 19. Solve each linear system. Write each coordinate to 2 decimal places.

Click here to see answer by Alan3354(69443)

Question 186056: begin by solving the linear equation for y. This will put the equation in slope-intercept form. Then find the slope and the y-intercept of the line with this equation. 3x - 4y = 12
Click here to see answer by hkelson(7)

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