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

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Question 514408: 1)solve both by elimination method: 5x+6y=2
10x+12y=4

2) 2r-7s=-12
7r+2s=11
Click here to see answer by solver91311(24713)

Question 514408: 1)solve both by elimination method: 5x+6y=2
10x+12y=4

2) 2r-7s=-12
7r+2s=11
Click here to see answer by stanbon(75887)

Question 514420: Is 4(6x-7y) equivalent to 4*6x-7y?

Click here to see answer by Maths68(1474)

Question 514440: find the slope (6,2) (-2,-4)
Click here to see answer by josmiceli(19441)

Question 514527: solve the systems of equations x+8y=8(1)
and x=5-8y(2)
Click here to see answer by solver91311(24713)

Question 514760: 4x-y=9
x-3y=16
solve graphically
Click here to see answer by mananth(16946)

Question 514584: How can you do this problem y = x - 3 and the domain is -2,0,2 and 4 and i need the range

PLEASE HELP !!!!!
Click here to see answer by richard1234(7193)

Question 514987: How do i solve the system for x and y? I need to solve for 1/x and 1/y first though.
5/x-4/y=-180
4/x-5/y=-180
Click here to see answer by stanbon(75887)

Question 515013: 1) use substitution to solve the following linear system algebraically
x-3y= -3
2x+y= 22
2) USE ELIMINATION TO SOLVE THE FOLLOWING LINEAR SYSTEM ALGEBRAICALLY
2X+Y= 4
5X-2Y= 1
3) FACTOR COMPLETELY
6X^3 + 9X^2 - 10X - 15
4) MN^2 - 4MN + N - 4
5) X^2 - XY - 30Y^2
Click here to see answer by richwmiller(17219)

Question 515016: 1- ABSOLUTE VALUE OF (3-X) -5=2 (3-X)-5=2
2- X^3+2X^2-8X
3- 5X^2+8X-4
4- 6M^2-17M+12
5- 49X^2-25Y^2
Click here to see answer by Edwin McCravy(20056)

Question 515080: What are the steps in simplyfiying 2(5+4y)/5 +10y=2 ?
Click here to see answer by Maths68(1474)

Question 515080: What are the steps in simplyfiying 2(5+4y)/5 +10y=2 ?
Click here to see answer by stanbon(75887)

Question 515134: 9x + 1/9 = x/2 +2
Click here to see answer by rfer(16322)

Question 515372: Please help me to solve this equation y=x+2.
y=xsquared
Click here to see answer by oberobic(2304)

Question 515553: Find an equation of the lien passing through each pair of points. Write the equation in the form Ax+By=C
(0,0) and (-1/8, 1/13)
Click here to see answer by oberobic(2304)

Question 515732: solve for r, 36r^2-1=0

Click here to see answer by Maths68(1474)

Question 515736: Expressing x as a function of y (from the first equation
Click here to see answer by oberobic(2304)

Question 516235: Solve the following system by substitution.
-x+3y=6
y=1/3x+2
Click here to see answer by mananth(16946)

Question 516283: To solve the system of linear equations, 3x + 3y = 0 and 4x + 2y = 3, what method would you avoid using? Explain why.
Click here to see answer by mananth(16946)

Question 516310: The solution of the following system is (-1, 3). Find A and B
Ax-2y=4
5x=By=-1
Click here to see answer by Alan3354(69443)

Question 516520: Please tell me if this equation is linear: 1/2y=1
Click here to see answer by deborabr(181)

Question 516591: Is x/4-y/3=1 a linear equation. How is it written in standard form?
Click here to see answer by solver91311(24713)

Question 516622: Dmitri needs 7 liters of a 36% solution of sulfuric acid for a research project in molecular biology. He has two supplies of sulfuric acid solution: one is an unlimited supply of the 56% solution and the other an unlimited supply of the 21% solution. Write out the equation you need to solve this problem and find how many liters of each solution Dmitri should use?
Click here to see answer by richwmiller(17219)

Question 516750: how to write 24y=40 x-18 in standard form
Click here to see answer by rfer(16322)

Question 516803: Solve
2x -5y -3z =7
-4x +10y + 2z = 6
6x -15y - z = -19
Click here to see answer by gc2000(22)

Question 516631: hello i need help understanding whether an equation is linear or not. if the equation is linear than how do you write it in standard form and what are the values of a,b,and c if so. example,2x+y/3-4
Click here to see answer by richard1234(7193)

Question 516905: I don't know how I got this wrong....One number is two more than a second number. Five times the first is 11 less than 4 times the second. Find the numbers.
I came up with the following equations:
x=2+y
5*X=4*Y-11
The value of the second number is 21. Apparently, this was wrong.
The value of the first number is 23.
Please explain.
Thanks.

Click here to see answer by mananth(16946)

Question 516945: I just statred college after I was off for 10 years. In high school I loved it and did great at it, but now steping in the college level they give only one examply for multiple of variations. Where could I look on the web for good examples on college algebra so I can better understand it. Another thing to if I do a problem and dont know if it is right I dont know if I am doing it correct. Is there any good online calulators that I can use to see if I am doing the problems right?
Click here to see answer by bucky(2189)

Question 516965: I have a problem that reads as follows: The total length of two ships is 2,351 feet. The difference in their lengths is 3 feet.
a) Find the length of each ship.
b) If a football field has a length of 100 yards, determine the length of the longer ship in terms of number of football fields.
The length of the longer ship is ____ ft.
The length of the shorter ship is ____ ft.
The length of the longer ship is _____ football fields.

Click here to see answer by mananth(16946)

Question 517050: i have to use the elimination method for this problem what are the correct ordered pair?
2x-3y=4
5x+2y=-9

Click here to see answer by mananth(16946)

Question 517050: i have to use the elimination method for this problem what are the correct ordered pair?
2x-3y=4
5x+2y=-9

Click here to see answer by JBarnum(2146)

Question 517146: 3x+3y=18
3x-5y=2
What is x and what is y???
Click here to see answer by stanbon(75887)

Question 517194: {-x+3y=-1
{x-2y=2 BY elmination
{x+y=7
{x+3y=11 by elmination
{4x-3y=-2
{4x+5y=14 by elmination
{x+2y=10
{3x-y=9 By elmination

Click here to see answer by Edwin McCravy(20056)

Question 517305: Multiply the Equation by a power of 10 to write an equivalent equation with integer coefficients.
2.5x+0.7=4.6-1.3x
Click here to see answer by rfer(16322)

Question 517360: Please show me how to solve.....2x+y+x=180 thank you,Ashley
Click here to see answer by solver91311(24713)

Question 517538: I have a word problem which needs to be translated into an equation:
Two motorcyclists start at the same point and travel in opposite directions. One travels 6 mph faster than the other. In 4 hours, they are 336 miles apart. How fast is each traveling?
Speed of slower motorcyclist _____ mph
Speed of faster motorcyclist _____ mph

Click here to see answer by scott8148(6628)

Question 517773: A grocer mixes cashews and almonds. A mixture of 4 pounds of cashews and 6 pounds of almonds cost $62. A mixture of 2 pounds of cashews and 8 pounds of almonds cost $54. What is the cost per pound of cashew and almonds?
Graphically?
Click here to see answer by richwmiller(17219)

Question 517780: how do I solve
3x-5(x+3)=16-4x
Click here to see answer by deborabr(181)

Question 518214: explain the similarities and differences between graphing using a t-table,graphing using the x- & y-intercepts and graphing using a linear equation. use 4x + 2y = 6 in your explanation as well as appropriate vocabulary.
Click here to see answer by richard1234(7193)

Question 518498: Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 miles per hour and Train B is traveling at 90 miles per hour. Train A passes a station at 1:15 A.M. If Train B passes the same station at 1:45 A.M at what time will train B catch up to train a?
Click here to see answer by richwmiller(17219)

Question 518941: how do i write and equation of the line through points (2,4) and (3,-3)?
Click here to see answer by nerdybill(7384)

Question 519098: I am having issues understanding how to find the slope in my problems. I also can not figure out how to do the equations to find points for graphing.
Click here to see answer by Alan3354(69443)

Question 519151: solve the equation │6x +3│= 15
Click here to see answer by Edwin McCravy(20056)

Question 519158: Systems of linear equations by substitution
2x-5y=10
y=2/5x-2
Click here to see answer by oberobic(2304)

Question 519052: -2y+2=-2(3y+7)
Click here to see answer by tracyc0912(40)

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