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

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Question 173162:
Linear ststems
solve using substitution
y=3-2x
y=5+2x

Click here to see answer by tutorcecilia(2152)

Question 173179: Solve the equation.
4(7x-1) = 16
Click here to see answer by Alan3354(69443)

Question 173182: Calculate
5(4+8) + 5 * 6/5(6-1)
Click here to see answer by user_dude2008(1862)

Question 173215: x+y=12
x-7=4

how do u go about solving a question like this??
Click here to see answer by jim_thompson5910(35256)

Question 173188: -4x+y=-5
2x+y=7
Click here to see answer by jim_thompson5910(35256)

Question 173242: if a cost of a pretzel is 2.40 per pound and the cost of potato chips is 3.40 how many pounds of pretzel and how many pounds of potato chips should be used to make a 2pound blend that cost $3 per pound?
Click here to see answer by Mathtut(3670)

Question 173267: I am having a problem understanding how to solve a system byusing substitution.
Here are few of the problems I'm facing. Could you please explain them to me?
1. y = -3x+19
y + 2x-1
2. y = x +4
3x-2y=6
3. 2x-y = 4
2x-y=3
I've looked at tons of reasons on how these problems work, and none of them make sense. The ones I've looked at are not specific enough on the what, why and how of the problem.
Thanks for your help!
Angela
Click here to see answer by jim_thompson5910(35256)

Question 173183: A salesperson has two job offers. Company A offers a weekly salary of $200 plus commission of 10% of sales. Company B offers a weekly salary of $400 plus commission of 5% of sales. What is the amount of sales above which Company A's offer is the same as Company B's?
Click here to see answer by Mathtut(3670)

Question 173318: Please help me. I have tried to get this for the past hour and a half. I give up.
2x+7y=22
-4x+9y=2
Find x and y and graph. Tyvm, judy
Click here to see answer by jim_thompson5910(35256)

Question 173339: I am really struggling with these type of problems. I have loked at several websoites for CLEAR instructions and this is the oly place but I need to get it in my head.

y=2x-2
y=-x-1
i now there is a solution cause they meet right? Please say yes!Help me so I can stop struggling.Thanks, Judy (Are they consistent independent with a unique solution? Thats what I had but can't find the pairs.
Click here to see answer by jim_thompson5910(35256)

Question 173356: Solve by graphing.
3x + 4y ≤ 12
x + 3y ≤ 6
x ≥ 0
y ≥ 0
Click here to see answer by stanbon(75887)

Question 173366: Two rainstorms occured in one week in an are.The 1st storm lasted 25 hours and the second storm lasted 30 hours for a total of 1450ml of rain.What was the rate of rainfall for each of the two storms if the sum of the two rates were 55 ml per hour?? I have tried multiplying, dividing,and came up with some enormous figure that I know was wrong. Thanks in advance. Judy
Click here to see answer by jim_thompson5910(35256)

Question 173476: A group of 52 people attended a ball game. There were three times as many children as adults in the group. Set up a system of equations that represents the numbers of adults and children who attended the ball game and solve the system to find the number of children who were in the group.
Click here to see answer by Mathtut(3670)

Question 173480: Problem:
Solve Y+(-16)=-12
The only thing i don't know is when you have +(-16) do you add or subtract to the other side?
Click here to see answer by Mathtut(3670)

Question 173480: Problem:
Solve Y+(-16)=-12
The only thing i don't know is when you have +(-16) do you add or subtract to the other side?
Click here to see answer by solver91311(24713)

Question 173484: Write a paper about systems of equations. You need to find a real world situation that can BEST be solved by graphing systems of equations.
You should explain the particular situation, write the equations, and show the solution using the graphing method.
Do the same for a situation requiring a system of equations that you will solve using the substitution method and another situation that you will solve using the elimination method.
(HINT: Technically, you will be describing three separate situations, three systems of equations, and three solutions)
Click here to see answer by solver91311(24713)

Question 173523: i Have been trying to get these and i cant. will you help me solve
x-y+z=-4
3x+2y-z=5
-2x+3y-z=15
Click here to see answer by scott8148(6628)

Question 173477: x-3y-z=-9
-2x+y+2z=3
2x+y+3z=8
Click here to see answer by solver91311(24713)

Question 173733: Please help me solve this. I am so lost it's pathetic.
x�+9=34
Click here to see answer by checkley77(12844)

Question 173709: Solve by addition or substitution.
3x + 5y = 2
2x + 5y = -2
Click here to see answer by elima(1433)

Question 173706: Please show me how to solve. I'm having trouble understanding from when I asked a few days ago.
Solve by graphing.
3x + 4y ≤ 12
x + 3y ≤ 6
x ≥ 0
y ≥ 0
Click here to see answer by ankor@dixie-net.com(22740)

Question 173837: How do i plot the formula y>(3/5)x-4?
with labeled lines.
Click here to see answer by solver91311(24713)

Question 173842: A shop sells skirts for $45 and blouses for $35. Its entire stock is worth $51,750, but sales are slow and only half the skirts and two-thirds of the blouses are sold, for a total of $30,600. How many skirts and blouses are left in the store?
Click here to see answer by stanbon(75887)

Question 173853: Ok, I am lost.I now have parallel to the lines. I need to find an equation of the line that is parallel to the line y=7x-3 and passes thru the point (8,7). I thought the answer was v-7 h-3 but am not positive.? Ty in advance. Judy
Click here to see answer by solver91311(24713)

Question 173905: Pls. show how to solve question below:
Eileen who is not yet 21 yrs old is 2 yrs older than Ida. Find Ida's age.
Click here to see answer by josmiceli(19441)

Question 173905: Pls. show how to solve question below:
Eileen who is not yet 21 yrs old is 2 yrs older than Ida. Find Ida's age.
Click here to see answer by stanbon(75887)

Question 173948: -x � 6 > -3x + 9
Click here to see answer by checkley77(12844)

Question 174003: a gas station that fills portable propane tanks such as are used for camping and for outdoor barbecues charges $2.60 per gallon.
Click here to see answer by Mathtut(3670)

Question 174005: I have a page of these with no examples(Not fr. a Textbook - a handout)...please show me one and I can figure out the rest....thanks, Jessie
Write whether each of these systems of equations has a common solution or not. Explain.
y = -x+2 y = 2x+1
Click here to see answer by stanbon(75887)

Question 174146: 2x-5y=-6
8x+3y=68
solve the system of equations and enter the solution as an ordered pair.
Click here to see answer by jim_thompson5910(35256)

Question 174146: 2x-5y=-6
8x+3y=68
solve the system of equations and enter the solution as an ordered pair.
Click here to see answer by jojo14344(1513)

Question 174146: 2x-5y=-6
8x+3y=68
solve the system of equations and enter the solution as an ordered pair.
Click here to see answer by Alan3354(69443)

Question 173899: 2x-y+z=10
4x+2y-3z=10
x-3y+2z=8
Click here to see answer by Alan3354(69443)

Question 174196: What is the equation of the line that passes through the given point and is perpendicular to the given line?
i got y= -2x-3
I wasn't really understanding the problem and that's why i just want you to check my work. Thankyou so much!
Click here to see answer by stanbon(75887)

Question 174195: Which equation represents the line that passes through (0,0) and is parallel to the line passing through (2,3) and (6,1)?
a) y= 1/2x
b) y= -1/2x
c) y= -2x
d) y= 2x
Click here to see answer by stanbon(75887)

Question 174200: What is the equation of the line that passes through the given point and is perpendicular to the given line?
(8,-1), 4y + 2x = 12

i got y= -2x-3.
I tried my best, but didn't quite understand the problem, so it would be great if you could check my answer. Thankyou so much!
Click here to see answer by jim_thompson5910(35256)

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