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

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Question 516750: how to write 24y=40 x-18 in standard form
Click here to see answer by rfer(12730)

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(5390)

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(12270)

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(12270)

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(12270)

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(2044)

Question 517146: 3x+3y=18
3x-5y=2
What is x and what is y???
Click here to see answer by stanbon(57967)

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(8999)

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(12730)

Question 517360: Please show me how to solve.....2x+y+x=180 thank you,Ashley
Click here to see answer by solver91311(17077)

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(9144)

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(5390)

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(9144)

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(7008)

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(31528)

Question 519151: solve the equation │6x +3│= 15
Click here to see answer by Edwin McCravy(8999)

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)

Question 519279: Marco invests his summer earnings of $2440. He invests part of the money at 8% per year and the rest at 7.5% per year. After one year these investments earned $193 in simple interest. How much did Marco invest at each rate?
My solution also has to have "let" statements.
Click here to see answer by mananth(12270)

Question 519421: Peggy paid $51.30 for 2 boxes of chocolates, 6 roses, and 3 greeting cards. Joe paid $72.05 for 3 boxes of chocolates, 12 roses, and 2 greeting cards. If 1 greeting card costs the same as 2 roses, how much does a box of chocolates cost
Click here to see answer by mananth(12270)

Question 519669: Solve using substitution:
3x+5y =-6 ; x=5y+3
I have solved that Y= 3/4 but im not sure what to do with the fraction to figure x out. Thank You. Angela

Click here to see answer by jim_thompson5910(28715)

Question 519722: x+y=3
x-y=5
Click here to see answer by jim_thompson5910(28715)

Question 519722: x+y=3
x-y=5
Click here to see answer by oberobic(2304)

Question 519824: What is
It is the pathagoream theorum by the way.
Click here to see answer by Alan3354(31528)

Question 519885: i dont understand how to write an equation for the line that is parallel to y=(4/3)x-7 ; and contains given point, (7,2).
Click here to see answer by rfer(12730)

Question 519885: i dont understand how to write an equation for the line that is parallel to y=(4/3)x-7 ; and contains given point, (7,2).
Click here to see answer by mananth(12270)

Question 519885: i dont understand how to write an equation for the line that is parallel to y=(4/3)x-7 ; and contains given point, (7,2).
Click here to see answer by stanbon(57967)

Question 519890: One number is 62 more than another number. If twice the greater number is subtracted from five times the lesser number, the result is 155. What are the two numbers?
Click here to see answer by mananth(12270)

Question 520377: How would you write a system of equations to find the concentration of salt in solution A and B when 3mm of solution A are mixed with 3mm of solution B and the result is a 40% salt solution, and when 4mm of solution A are mixed with 2mm of solution B and the result is a 35% salt solution?
I was thinking 3x+3y=.4; 4x+2y=.35 but it doesn't seem right?
I would be very appreciative if someone could help me thank you!
Click here to see answer by scott8148(6628)

Question 520446: Assume that the number of defective basketballs produced is related by a linear equation to the total number produced. Suppose that 10 defective balls are produced in a lot of 325, and 17 defective balls are produced in a lot of 450. Find the number of defective balls produced in a lot of 550 balls.
Click here to see answer by josmiceli(9817)

Question 520541: x-y+9z=-27
2x-4y-z=-1
3x+6y-3z=27
I have tried and tried on this problem for an hour and have gotten different answers each time. All I need to know is what are the values of x, y, and z?
Thank you.
Click here to see answer by scott8148(6628)

Question 520699: Pratap Puri rowed 18 miles down the Delaware River in 2 hours, but the return trip took him 4 1/2 hours. Find the rate Pratap can row in still water, and find the rate of the current.
Let x= rate Pratap can row in still water and y = rate of the current
Downstream x+y
Upstream x-y
I think the first one is 2x+y=18
I can't figure out the second part. Something like:
x=y-4.5.

Click here to see answer by mananth(12270)

Question 520985: i would like it if you could check my answers on turning point slope form into standard form. the original problem was this: y+5=-5(x-3)i got: 5x+y=10
problem: y-10=-2(x-3) i got: 2x+y=16 problem: y-2=-1/2(x-4) i got: 1/2x+y=4
please check,if they are wrong can you correct. thanks
Click here to see answer by lwsshak3(6761)

Question 521313: How would I solve y = 15 - 3x and 7y + 3x = 15 using the substitution method? I tried plugging the y = 15 - 3x for the y but I came up with a decimal answer and I don't think it's supposed to be a decimal?
Click here to see answer by mananth(12270)

Question 521318: Hello, I am working on the problem 9x + 3y - 5 = 0 and 3x + y = 5/3. It's asking to solve the system of equations using substitution. I don't get what I have to plug in to get the answer?
Click here to see answer by mananth(12270)

Question 520995: find the solution of the system y=x^2+5 y=2x+4
Click here to see answer by umnikmo(75)

Question 521832: y+5x=0
x+y=12
how do you do this? please show all steps

Click here to see answer by umnikmo(75)

Question 521832: y+5x=0
x+y=12
how do you do this? please show all steps

Click here to see answer by oberobic(2304)

Question 521829: 2.00x+1.5y=550.00
x=3y-100
i need to graph so im guessing it needs to be in slope intercept form? i keep getting decimals and i need help
Click here to see answer by oberobic(2304)

Question 521970: the length of a rectangle is 7 meters less than twice he width. If the perimeter is 40 meters, find the dimensions of the rectangle.
Click here to see answer by mananth(12270)

Question 522095: if x + 3y + 2z = 48 and 2x + 3y + 4z = 69, then the value of 3x + 3y + 6z is

Click here to see answer by Edwin McCravy(8999)

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