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

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Question 201023: Solve using elimination
3r-5s=-3
5r+3s=29
find soultions
Click here to see answer by jim_thompson5910(28476)

Question 201107: x+2y=8
-x-y=-3
Click here to see answer by Alan3354(30959)

Question 201106: 5x+3y=7
x-6y=8
Click here to see answer by jim_thompson5910(28476)

Question 201105: -x+6y=3
3x-2y=5
Click here to see answer by jim_thompson5910(28476)

Question 201104: 2x+4=4
y=-2x+4
Click here to see answer by jim_thompson5910(28476)

Question 201191: I can't come up with a solution to this can some one help please?
X+Y+2Z=8
X+Y+5Z=11
X+6Y+4Z=30 THE TRIPLE SOLUTION SET IS?
Click here to see answer by scott8148(6628)

Question 201232: A student opens his math book to two facing pages. The product of the page numbers is 1482. Find the page numbers.
What would I use to solve this, please?
Click here to see answer by solver91311(16868)

Question 201241: 5(t-3)-7t = -13
I've tried: 5t -15 - 7t = -13; 5t - 7t = -13 + 15; 2t = 2; t = 1 but that doesn't seem to work out. Know I'm doing something wrong, but not sure what.
Click here to see answer by Alan3354(30959)

Question 201154: solve systems of equations by graphing
1. y = 2x -4
y = -3x+1
2. 3x - 7y = -6
x + 2y = 11
3. 2x +3y = 7
2x - 3y = y
4. 1/4x + 2y = 5
2x - y = 6
5. 1/2x - y = 0
1/4x +1/2y = -2
Click here to see answer by jojo14344(1512)

Question 201273: solve the system analytically: x + y + z = 10 2x + 6y + 2z = 40 -x + 7y - 3z = 26

Click here to see answer by Edwin McCravy(8879)

Question 201332: Do lines always intersect?

Click here to see answer by nerdybill(6948)

Question 201351: Grapes cost $1.00 per pound and Oranges cost $.80 per pound. If Brandon buys 14 total pounds of fruit and it costs him $14.00, how many pounds of each did he buy?
Click here to see answer by Alan3354(30959)

Question 201434: 2x+3y=4
x+4y=6
Click here to see answer by jim_thompson5910(28476)

Question 201584: 2x-5y=-14 4x-3y=8 State exact values. If the system is dependent, express the solution set in terms of one of the variables
Click here to see answer by jim_thompson5910(28476)

Question 201571: solve system by graphing
y=-1/3x+3
y=-7/3x-3
Click here to see answer by jsmallt9(3296)

Question 201619: Solve system by graphing
y=1/4x-3
y=5/4x+1
Click here to see answer by Alan3354(30959)

Question 201618: solve system by graphing
y=5/3x-4
y=-2/3x+3
Click here to see answer by Earlsdon(6287)

Question 201631: -x+3y=0
2x+6y+12
Click here to see answer by jim_thompson5910(28476)

Question 201099: 3-[4+3(2-5)2power]2power+3(4-1)
Click here to see answer by rfer(12644)

Question 201739: How do you solve the systems of linear equations using the graphing method?
I understand the elimination method and etc., but I do not get how to solve using the graphing method.
I know that the first step is putting it in slope-intercept form, but the graphing part I am having trouble with. How do you graph it exactly? Is there a specific way to plot points?
For example, how do you solve for this:
4x+2y=8
y=-2x+6
So far I tried doing it, and I've gotten the answer (3,2) but I did it again and there was no solution because it was parrallel.
Click here to see answer by stanbon(57219)

Question 201752: Can you please explain to me how to go about dividing the expression below?

Thank you.
Click here to see answer by jim_thompson5910(28476)

Question 201752: Can you please explain to me how to go about dividing the expression below?

Thank you.
Click here to see answer by RAY100(1637)

Question 201792: Please help me solve this equation: Is the ordered pair (0,5) a solution of the system of linear equations x+y=5, -5x+2y=10? yes or no
Thank you so much for taking out the time to read this, hopefully I will better understand it after you help me.
Click here to see answer by Alan3354(30959)

Question 201817: Consider the following system of equations:
{4x-7y=-5
5x+3y=29
Does the system have: one solution, no solution or infinite solutions?d
Click here to see answer by jim_thompson5910(28476)

Question 201826: Solve by Substitution,
I need a help please!
7x-8y=-1
6x+36=y
7x-8(6x+36)=-1
7x-48x-288= -1
41x=287
x=-7
AND
y=???? How??
Thank you!

Click here to see answer by Alan3354(30959)

Question 201826: Solve by Substitution,
I need a help please!
7x-8y=-1
6x+36=y
7x-8(6x+36)=-1
7x-48x-288= -1
41x=287
x=-7
AND
y=???? How??
Thank you!

Click here to see answer by RAY100(1637)

Question 201864: Please help!
Solve by substitution method.
7m+n=7
m-8n=58
m=7-7m
m-8(7-7m)=58
m-56+56m=58
?=114
Click here to see answer by Alan3354(30959)

Question 201869: 5x-6y=-6
5x+51=y
5x-6(5x+51)=-6
5x-30x+306=-6
25x-300
x=-12,
and
y=5x+51
=-56+51
= my answer was -5 but, real answer is -9...
Can you please help me understand this?
Thank you so much!!!!

Click here to see answer by rfer(12644)

Question 201925: Please! help me with this. thank you so much!!!
6x+5y=-3
-5x+y=49
y=49+5x
6x+5(49+5x)=-3
6x+245+25x=-3
31x+248
x=-8
y=??? and how??
Click here to see answer by jim_thompson5910(28476)

Question 201952: Solve by the elimination method.
9x-9y=18
7y-3x=-8
-3x+7y=-8
9x-9y=18
-3x+7y=-8
-9x+21y=-24
9x-9y=18
12y=-6
y=???
I really need help with this one. Thank you so much!!!
Click here to see answer by rfer(12644)

Question 201975: x - y = 10
x - y = -2
What is the ordered pair?
Is the system consistent or inconsistent?
Is it dependent or independent?
Can someone also give me a break down of how to do this because I am very confused! Thank you!: Solve the system of equations by graphing. Then classify the system.

Click here to see answer by jim_thompson5910(28476)

Question 201995: Solve by graphing
2x+y=5
3x-y=10
Click here to see answer by Alan3354(30959)

Question 202001: Mom made two baches of iced tea. the first contained 6% sugar and was too sweet the second contained 3% sugar and was too sour how many cups should she take from each batch to make 9 cups of iced tea containing 4% sugar.
Click here to see answer by jim_thompson5910(28476)

Question 202000: 3x+3y+z=8
x-3y+2z=-3
8x-2y+3z=11
Click here to see answer by jim_thompson5910(28476)

Question 202005: the sum of two numbers is 16 when the small number is subtracted from two times the larger number the difference is 20 what are the two numbers
Click here to see answer by jim_thompson5910(28476)

Question 202008: Could you guide me about the following problem?Tanks..
N.has invested a total of $8000, some at 4% and the rest at 7%. If the 4% invenstment yields $155 more than the 7% invenstment, how much was invested at 4%?
I've written: 8000=2x+155 . Is it correct or I must use of either 4% and 7%?
Click here to see answer by jim_thompson5910(28476)

Question 202037: the instruction here is "use the intercepts to graph each equation"
then, can you help me solve this one (((y + 3x -2 = 0)))...
Click here to see answer by jojo14344(1512)

Question 202053: Need help Solving the system by the addition method:
4x + 8y = 6
3x – 8y = 7
7x = 13
I added the x's and the y's cancelled and that left me with 7x=13?
I don't think this answer is correct though. Please let me know what I am
doing wrong?
Click here to see answer by jim_thompson5910(28476)

Question 202069: Need help with writing the following problem as a system of two equations in two unknowns. Solve the system using the substitution method:
The sum of two numbers is 2, and their difference is 26. Find the numbers.
Not even sure where to start..
Here is my try:
x+y=2=26?
Click here to see answer by jim_thompson5910(28476)

Question 202111: Need help completing the ordered pairs (4, ?) and (?, 5)
that satisfy the equation 3x – 6y = 7.
here is my try: 3x-6y=7
/3 /3
6y/3
y=2?
Need help solving this and finding the ordered pairs. Thanks
Click here to see answer by rfer(12644)

Question 202120: The area of a trapezoid is A=(a+b)h over 2. If A=300, h=5, and b=30, what is the value of a?
Click here to see answer by rfer(12644)

Question 202188: 5y-3x=1
4y+2x=80
Click here to see answer by jim_thompson5910(28476)

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