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

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Question 76061: What is the solution for x-y=1 and x=1/2y+2 in Solving Systems Using Substitution?
Click here to see answer by rmromero(383)

Question 76062: -9x+12y=18

x-2y=3
Click here to see answer by rmromero(383)

Question 76067: you are in charge of buying softballs for three different leagues. The Pony league uses an 11 inch softball priced at $2.25. The Junior and Senior Leagues use a 12 inch softball priced at $2.75. The invoicesmeared in the rain. You can still read the totals, 80 softballs for $210. How many of each size are there?
Click here to see answer by ptaylor(2198)

Question 76127: Solve by the addition method.
7x-4y=-3
x+2y=3
Click here to see answer by checkley75(3666)

Question 76268: Solve the system by addition.
5x � 3y = 13
4x � 3y = 11

Click here to see answer by Cintchr(481)

Question 76272: Solve the system by addition.
�3x + 5y = �18
x � 2y = 7

Click here to see answer by checkley75(3666)

Question 76332: I need some help. Can anyone tell me what the solution is to this problem using substitution?
y=-2/3x+4
2x+3y=-6

Click here to see answer by scott8148(6628)

Question 76599: Please find X and Y: 2X + 3Y = 16, 5X - 3Y = 44.
Click here to see answer by checkley75(3666)

Question 76605: my son has missed a week of school due to illness and he needs my help with graphing linear equations by plotting.y=1/2x-3 or another problem is 3x+y=7. I really just to know if i'm telling him right it has been years. Thanks for the help chris
Click here to see answer by checkley75(3666)

Question 76516: How do I simplify this 1/x - 1/b over 1/xb + 1/2
Click here to see answer by ankor@dixie-net.com(22740)

Question 76688: Solve the system by addition or substitution.
�4x + 2y = �12
y = 2x � 7
Click here to see answer by funmath(2933)

Question 76689: Solve the system by addition.
�3x � 5y = �5
x � 2y = 9
Click here to see answer by funmath(2933)

Question 76746: Find two numbers whose sum is 10 and whose squares differ by 20
Click here to see answer by checkley75(3666)

Question 76845: If you solve the system below with substitution by using the "shortest" route, which step would you get?
2x + 5y = 10
x + 3y = 8
I got:
5-2.5y + 3y = 8
Is this correct? Can you help?
Click here to see answer by funmath(2933)

Question 76844: Bob owns a car wash and pays his employees either $5 plus 2% commission or $3 plus 4% commission. How much would sales have to be for the pay to be equal?
I got:
y= 5+.02x
y= 3+.04x
Not sure what x=?
Can you help?
Click here to see answer by checkley75(3666)

Question 77030: Next year, Lyle will be twice as old as Sean will be. Four years ago, he was three times as old as Sean was. How old is each?
Click here to see answer by ankor@dixie-net.com(22740)

Question 77287: I'm very confused with this whole chapter so I need some help:
solve each system:

#12. this is all in() 9x+4y-z=0
3x-2y+4z=6
6x-8y-3z=3

Click here to see answer by stanbon(75887)

Question 77361: how to solve an equation of a line
Click here to see answer by checkley75(3666)

Question 77528: determine graphically the point of intersection between the lines defined by y=-2x+6 and 8=5x-y.

i have no idea how to do this so i coudnt show my work. sorry.
Click here to see answer by Earlsdon(6294)

Question 77575: The problem: write in slop-intercept form and sketch the line. 4x-y-2=0
I know that I solve like this:
4x-2=y or y=4x-2
Therefore, m=4 and y=-2
but then how do I plot it on the graph?

Click here to see answer by checkley75(3666)

Question 77486: Hello out there,I had some problems that I need some help with badly,and thanks to whoever can help,the first question is,Determine if the equation is linear,and if it is put it in standard form.9y=4x-18.The next one is,xy=4.The next one is,x(with a 2 next it,I guess it means to the second power)-4=y.And the last problem is kinda hard,Two diced are rolled.Express a relation in a table for the possible numbers showing on the first die x and the second die y if the outcome is two odd numbers whose sum is a least 8.Thanks to whoever can help.
Click here to see answer by stanbon(75887)

Question 77716: Luis and Julia have the same number of coins. Luis has only dimes and Julia has only quarters. If Julia has $1.80 more than Luis does, how many coins does each have?
Click here to see answer by stanbon(75887)

Question 77715: Kelly has 24 dimes and quarters worth $3.60. How many quarters does she have?
Click here to see answer by checkley75(3666)

Question 77823: I really need some help on substitution methods I have tried all the problems. I understood a the beginning, but then it got harder. The problem is y/2-x=1 and x+y+7=0.
Click here to see answer by Earlsdon(6294)

Question 77827: I also have another question, here it is. It is on the substitution method. Here it is 3b-2a=4 and b/2-2a/3=1
Click here to see answer by uma(370)

Question 77829: Sorry, but I have one more question on the substitution method. It is a+b=5000 and 0.08a=0.06b-20 THANKS ALOT
Click here to see answer by uma(370)

Question 77992: I was doing algebra and could not figure out a problem. it is: If Bill rides his beke 3 mi to Fred's house and then walks with Fred the remaining 1mi to school, it will take him 30 min. But if he rides the entire distance, it will take hime only 20 min. Find his biking speed and walking speed. I an really confused. Please help me.
Click here to see answer by stanbon(75887)

Question 77991: Hello.
I was working on algebra and I got caught up one stroy probliem, that involves two variables. The Question is: Melinda Bowen recieves an annual income of $234.50 from investing one amount of money at 6% and another amount at 5%. If the investments were interchanged, her income would increase by$5.10. Find the amounts she invested. When I did it it by 5n+6x=23450. Then 6x=5n-23450. From there I did not know what to do
Click here to see answer by stanbon(75887)

Question 77936: write an equation of the line that passes through the given point and is parallel to the given line. Write the answer in slope-intercept form.
(4,-2),x=(5/4y)-2
Click here to see answer by checkley75(3666)

Question 77935: Write an equation of the line that passes through the given point and is perpendicular to the given line. Write the answer in slope-intercept form.
(0,0), y=4x-7

Click here to see answer by checkley75(3666)

Question 77934: Write an equation of the line that passes through the given point and is perpendicular to the given line. Write the answer in slope-intercept form.
(0,0), y=4x-7

Click here to see answer by tutorcecilia(2152)

Question 77933: Write an equation of the line that passes through the given point and is perpendicular to the given line. Write the answer in slope-intercept form.
(0,0), y=4x-7

Click here to see answer by scott8148(6628)

Question 78113: Completing the square
2x� - 8x - 9 = 0
Click here to see answer by bucky(2189)

Question 78389: Find the distance between the lines with the following equations.
3x-y+4=0 and 3x-y=0

Click here to see answer by dolly(163)

Question 78470: Find values for m and b in the following system so that the solution to the system is (-3, 4).
5x + 7y = b
mx + y = 22
Please help.
Click here to see answer by checkley75(3666)

Question 79185: How do I solve this? I've tried by susbtitution and elimination without success.
(1/3)x - (3/2)y = -5
(3/4)x + (1/3)y = 11
Thank you!
Click here to see answer by scott8148(6628)

Question 79317: Trader Joe has 3 pounds of walnuts and 6 pounds of almonds sell for $51. Five pounds of walnuts and 4 pounds sell for $55. Find the price of 1 pound of almonds.
I am Totally confused. Trying to help my son. Please help.
Click here to see answer by Earlsdon(6294)

Question 79314: graph 2x+y=6
2x-y=-2
Click here to see answer by rmromero(383)

Question 79305: graph y=-2 and 3x-y=-1
and name if it has no solution, one solution, or infinitely many solutions if it has one solution name it
Click here to see answer by rmromero(383)

Question 79323: A square room has a square rug in it. The area of the room not covered by the rug is 51 sq feet. The sum of the lenght of a side of the rug and the lenght of a side of the room is 17 feet. Find the dimensions of the room.
I know Area=LenghtxWidth and Perimeter is 2Lenght + 2 Width, but I can't figure out this one. Please help.
Click here to see answer by stanbon(75887)

Question 79315: graph 3x+2y=6
3x+2y=-4
Click here to see answer by chitra(359)

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