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

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Question 780525: x/3=7 - I do not know how to do this with fractions. Please help!
Click here to see answer by rfer(16322)

Question 780528: Find two numbers, knowing that their sum is 1240 and one of the numbers is 24 more than three times the other number
Click here to see answer by rfer(16322)

Question 780712: 6(3-z)/5=-z
3(x-5)/2=2(x+5)/3
Click here to see answer by rfer(16322)

Question 781648: Find the missing value
x=3 is a solution of 5x-?=11
Click here to see answer by tommyt3rd(5050)

Question 781947: Given the following two equations:
y = 18x + 370
y = 46x + 170
These two lines intersect at the point where the x value is equal to ?
I set the equations equal to each other.
18x+370=46x+170 subtract terms
28x=200 divide
x=7.14
But when I check 7.14 is wrong.
Click here to see answer by Alan3354(69443)

Question 781959: i got 2 as my answer for the following problem. 2(3x-4x)=2x
Click here to see answer by Alan3354(69443)

Question 781993: Solve the System
3/4x + 2/5y = 13
1/3x - -3/10y = 1
can I get help on solving to the answer? here is what I have so far...
3/4x + 2/5y = 13
-3/4x -3/4x
..........
2/5y = 13 - 3/4x.
That's all I have. It s the fractions that are confusing me. Can I get rid of them of do I have to actually add/sub them like normal?
Help would be appreciated!!!! thank you!
Click here to see answer by MathLover1(20850)

Question 782002: m=-6(-4,1)

Click here to see answer by oscargut(2103)

Question 782519: At what point (x, y) do the following functions intersect (if at all)? 5X + 3Y = 2 and 2.5X + 2Y = 3
Click here to see answer by Gogonati(855)

Question 782519: At what point (x, y) do the following functions intersect (if at all)? 5X + 3Y = 2 and 2.5X + 2Y = 3
Click here to see answer by waynest(281)

Question 783372: _3x+2=5+7x
Click here to see answer by stanbon(75887)

Question 783539: (7a+3)+(-a-5)=-16
Click here to see answer by jim_thompson5910(35256)

Question 783817: Ok so I have a graph that has one point on it the point is (2,1) my chooses are y=1/4x
y=10x
y=5x
y=1/2x
I have no clue as to what i'm looking for please help me
Click here to see answer by MathTherapy(10552)

Question 783877: Monica has $1, $5, and $10 bills in her wallet that are worth $96. If she
had one more $1 bill, she would have just as many $1 bills as $5 and $10
bills combined. She has 23 bills total. How many of each denomination
does she have?Please show me the steps.
Click here to see answer by xinxin(76)

Question 784137: Can someone help me solve this problem?
Solve each system by the substitution method.
3x+5y=1
x=y+3
Click here to see answer by wilft1(217)

Question 784789: Can someone help me solve this?
Solve the system by graphing both equations on the same axes. Give the ordered pair for the point of the intersection.
Click here to see answer by fcabanski(1391)

Question 784825: Can someone help me solve this problem?
Solve the system by graphing both equations on the same axes. Give the ordered pair for the point of intersection.
x+2y=4
6y=-3x+12
Click here to see answer by Alan3354(69443)

Question 784916: y=1/2x-2
y=3/4x+4 Solve using method of elimination
Click here to see answer by Alan3354(69443)

Question 785230: Four times the sum of three and a number is 3. What is the number?
I have no clue how to set this up!
Click here to see answer by wilft1(217)

Question 785249: Solve the system by graphing both equations on the same axes. Give the ordered pair for the point of intersection.
x+2y=4
6y=-3x+12
Click here to see answer by wilft1(217)

Question 785071: To deliver a message, an army officer will travel by car at 75mph from Camp A to Camp B, and then by plane to Camp C against a wind blowing 40 mph. The airplane can fly 280 mph in still air. If the messenger takes 3 2/3 hours in going from Camp A to Camp C and 3 1/6 hours for the return trip, what is the distance from Camp A to Camp C?
Click here to see answer by ankor@dixie-net.com(22740)

Question 785263: Solve the system by graphing both equations on the same axes. Give the ordered pair for the point of intersection.
x-2y=6
x+2y=2
Click here to see answer by waynest(281)

Question 785090:
Click here to see answer by tommyt3rd(5050)

Question 785633: Solve the system by the substitution method.
3x/2+y/5=-3
4x+y/3=-11
Click here to see answer by stanbon(75887)

Question 785627: Solve the system by the substitution method.
2x-y=-8
x+2y=11
Click here to see answer by Alan3354(69443)

Question 785635: Solve the following problem.
The Nile River is 394 kilometers longer than the Amazon River. The two rivers have a total length of 12,986 kilometers. How long is each river?
Click here to see answer by harpazo(655)

Question 785622: Solve the system by the substitution method.
2x+y-x=3y+5
y+2=x-5
Click here to see answer by waynest(281)

Question 785725: Don't know how to solve this problem. 122=8a+10
Click here to see answer by rfer(16322)

Question 785779: Solve the system by the elimination method.
-4x=25-3y
6x=5y-39
Click here to see answer by mananth(16946)

Question 785778: Solve the system by the elimination method.
5x-2y=3
10x-4y=5
Click here to see answer by mananth(16946)

Question 785776: Solve the system by the elimination method.
6x+7y=4
5x+8y=-1
Click here to see answer by mananth(16946)

Question 785783: One hundred theater tickets were sold. Orchestra seats cost $75 and balcony seats cost $40. The total receipts from ticket sales were $5,400. How many of each were sold?
Click here to see answer by mananth(16946)

Question 785782: A cashier has 20 bills, all of which are $10 or $20 bills. The total value of the money is $330. How many of each type does the cashier have?
Click here to see answer by mananth(16946)

Question 785784: Jen invested $7,500 in two back accounts, one paying 4% simple interest, and the other paying 6%. If her annual interest from the two accounts is $420, how much did she invest at 6%?
Click here to see answer by mananth(16946)

Question 785789: A cashier has 20 bills, all of which are $10 or $20 bills. The total value of the money is $330. How many of each type does the cashier have?
Click here to see answer by mananth(16946)

Question 785786: One hundred theater tickets were sold. Orchestra seats cost $75 and balcony seats cost $40. The total receipts from ticket sales were $5,400. How many of each type were sold?
Click here to see answer by mananth(16946)

Question 785774: Solve the system by the elimination method.
x/2+y/3=7
x/4+2y/3=8
Click here to see answer by mananth(16946)

Question 785753: Solve the system by graphing both equations on the same axes. Give the ordered pair for the point of intersection.
x+y=6
3x-y=-2
Click here to see answer by mananth(16946)

Question 785948: Your college newspaper, The Collegiate Investigator, has fixed production costs of $76 per edition and marginal printing and distribution costs of 41�/copy. The Collegiate Investigator sells for 51�/copy.

(a) Write down the associated cost function C(x) in dollars.
C(x) =

Write down the revenue function R(x) in dollars.
R(x) =

Write down the profit function P(x) in dollars.
P(x) =

(b) What profit (or loss) results from the sale of 500 copies of The Collegiate Investigator?
$
(c) How many copies should be sold in order to break even?
copies
Click here to see answer by xinxin(76)

Question 786386: It takes Dan 2 hours to paddle his canoe 16 miles downstream, and 8 hours to return to the campsite. Find the speed of the canoe in still water.
Click here to see answer by mananth(16946)

Question 786385: Jen invested $7,500 in two bank accounts, one paying 4% simple interest, and the other paying 6%. If her annual interest from the two accounts is $420, how much did she invest at 6%?
Click here to see answer by mananth(16946)

Question 786911: according to recent statistics the number of pay telephones in a certain state is expected to decrease by 201,000 over the next ten years this repersents a decrease of 15% from the number in a state currently find the number of pay telephones in the state currently
Click here to see answer by rfer(16322)

Question 786921: Could you help solve this word problem: There were 174 words typed in 3 minutes. There were 348 words typed in 6 minutes. How many words will be typed in 8 minutes?
Click here to see answer by xinxin(76)

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