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

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Question 182163: Please answer this equation:

Click here to see answer by checkley77(12569)

Question 182168: Please answer this equation:

Click here to see answer by J2R2R(94)

Question 182160: Please help me to solve this equation:
.
Click here to see answer by mastermath(14)

Question 182217: Please help, I'm not good at word problems.
Two of the top grossing concert tours were by a jazz band and a rock band. Together, the two tours visited 174 cities. The jazz band visited 96 cities more than the rock band.
How many cities did each group visit.
Jazz Band
Rock Band
Click here to see answer by checkley77(12569)

Question 182216: Hello, I need help solving this word problem. I don't know where to begin.
Christine went shopping and bought each of her five nephews a gift, either a video costing 14.95 or a cd costing 16.88. She spend 76.68 on gifts. How many videos and how many cds did she buy.
Click here to see answer by checkley77(12569)

Question 182242: How do you solve two problems at the same time and get a coordinationes
example 2c-d=-2 second problem is 4c+d=20
Click here to see answer by stanbon(57967)

Question 182272: BEEHIVE.... A farmer is tracking two wild honey bees in his field. He maps the first bee's path to the hive on the line 7y = 9x
The second bee's path follows the line y = -3x + 12. Their paths cross at the hive. At what coordinates will the farmer find the hive?

I think that I should try to line the variables up on one side, then add one set of variables together and also the integers and then solve for that respective variable. After solving for that variable, I can plug it back into one the two line equations and then find the other variable. The two variable points I get are where the bees' paths intersect?

I made 7y=9x----> 7y-9x=0
I made y=-3x+12----> y+3x=12

I then added the x's together and get -6x=12...solving by division for x, I get x=-2
plugging -2 for x back into the second equation I get y=18 but this does not work at all for the top equation!
Where have I gone wrong or what do I need to do differently????
Click here to see answer by Alan3354(31528)

Question 182297: stuggling with this don't know where to start
2t(2t-a)=y(y-x)
solve a in terms of y and t
Click here to see answer by vleith(2825)

Question 182303: can you show how to do

Click here to see answer by stanbon(57967)

Question 182303: can you show how to do

Click here to see answer by Edwin McCravy(8999)

Question 182302: can you show me how to do
5x-1 over 2 = 4 - x over 2
Click here to see answer by stanbon(57967)

Question 182348: How do I find the x-coordinate of the vertex of the the graph?
y=2x(squared)-40x+10

Click here to see answer by nerdybill(7008)

Question 182398: I always get stuck on the word problems. Can you help me?
*A grocer made a barrel of mixed nuts consisting of cashews and almonds. The barrel contained 62 pounds of nuts. There are twice as many pounds of cashews as almonds. Find the number of pounds of cashews and of almonds in the barrel.

I tried this:
let c= cashews
let a= almonds
c+a= 62 lbs
c= 2a
Then i tried:
2a+a=62
3a=62 , but that is incorrect. Please help me!?
Click here to see answer by Fombitz(13828)

Question 182416: What similaries and differences are there between functions and linear equations? Are all linear equations functions ?
Click here to see answer by stanbon(57967)

Question 182416: What similaries and differences are there between functions and linear equations? Are all linear equations functions ?
Click here to see answer by solver91311(17077)

Question 182416: What similaries and differences are there between functions and linear equations? Are all linear equations functions ?
Click here to see answer by Mathtut(3670)

Question 182435: hi i'm having an extreme amount of trouble setting up word problems for linear equations , especially this one .

Your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on the test. How many of each type of question are on the test?
Click here to see answer by stanbon(57967)

Question 182434: hi i'm having an extreme amount of trouble setting up word problems for linear equations , especially this one .

Your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on the test. How many of each type of question are on the test?
Click here to see answer by Alan3354(31528)

Question 182444: i need help !!!!

Suppose you invest $1500 in equipment to put pictures on t-shirts. You buy each t-shirt for $3. After you have placed the picture on a shirt, you sell it for $20. How many T-shirts must you sell to break even ?
Click here to see answer by Mathtut(3670)

Question 182539: fing a number such that 4 less than two-thirds the number is equal to one-sixth the number
Click here to see answer by Mathtut(3670)

Question 182549: 3b.
this one has me simply dumbfounded. Please help if you can. Thanks.
How many solutions does the following system have:
4x + 8y = 16
3x + 6y = 9
Explain how to determine the number of solutions without solving the system. Then apply elimination, and interpret the resulting expression.
Click here to see answer by stanbon(57967)

Question 182523: I need help. During problem using the elimination method, we came down to
3x - 2(-170/19)= 40. Their answer for x was x= 140/19. How did they get this? I got x=220/30. Please walk me thru each step.
Click here to see answer by Mathtut(3670)

Question 182497: I have a 4 by 4 system of equation that I'm trying to solve using a matrix.
I'm very stuck on the row reduction. Please help.
Here are my equations:
a+b+2c+d=14
2a-b-c+d=8
a+2b+c-d=15
3a-2b+3c+2d=24
and this is the matrix I have so far (sorry, I'm not sure how to put the brackets):
[1 1 2 1] [14]
[2 -1 -1 1] [8]
[1 2 1 -1] [15]
[3 -2 3 2] [24]
Please help me. This is due today. I've been working on it all night.
Click here to see answer by jim_thompson5910(28715)

Question 182559: A merchant blends tea that sells for $2.85lb with tea that sells for $2.60lb to produce a 90lb mixture that sells for $2.75lb. How many pounds of each type of tea does the merchabt use in the blend?
Click here to see answer by checkley77(12569)

Question 182607: Please Help.
Use elimination to solve each system of equations.
3M-N=26 -2M-N=-24
Click here to see answer by checkley77(12569)

Question 182609: Please Help.
Use elimination to solve each system of equations.
2X-3Y=9 -5X-3Y=30
Click here to see answer by jim_thompson5910(28715)

Question 182608: Please Help.
Use elimination to solve each system of equations.
X+4Y=11 X-6Y=11
Click here to see answer by jim_thompson5910(28715)

Question 182627: assignment reads: determine equation of the line described. Put answers in the slope-intercept form if possible:
Through(8,1), parallel to -8x + 3y = -43
Click here to see answer by solver91311(17077)

Question 182625: 3(2x+1)=9-5(2x-3)
Click here to see answer by jim_thompson5910(28715)

Question 182658: What is the steps and solution to Top: x+2y=7 Bottom: 2x-3y=-21 using the Elimination method?
Click here to see answer by jojo14344(1512)

Question 182657: What is the steps to the solution to Top: 3x-11y=2 Bottom: x-5y=2 using the elimination method?
Click here to see answer by jojo14344(1512)

Question 182618: Please Help.
Use elimination to solve each system of equations.
7M+4N=2 7M+2N=8
Click here to see answer by jojo14344(1512)

Question 182813: Temperature on the Fahrengeit scale is a linear function of temperature on the Celsius scale. Ten degrees Celsius equals 50 degrees Fahrenheit, and 25 degrees Celsius equals 77 degrees Fahrenheit.
Click here to see answer by Alan3354(31528)

Question 182878: How do you graph the solution of the linear system:
3x+4y=12 and
y=1
and
Graph the solution of the linear system:
y=0
9x+3y=18
3x+6y=18
Click here to see answer by Alan3354(31528)

Question 182960: It costs $1.70 to buy supplies to make a fork and $1.30 to buy supplies to make a spoon. The store sells the fork for $5.60 and the spoon for $5.40. They spent $37.90 on materials for forks and spoons. They sold the finished product for $147.20. How many forks and how many spoons did they make?
I did 1.70x + 1.30y = 37.90 as one of my equations
5.60x + 5.40y = 147.20 for my other
I have tried substitution and get tangled up with the decimals
I have tried addition and get messed up. Seems I get decimal answers and can't seem to work it into a whole fork or whole spoon without it being a decimal. What am I doing wrong, or are my equations not correct and this is where Im going wrong.
Click here to see answer by jim_thompson5910(28715)

Question 183031: HELP. Use elimination to solve each system of equations. 2X+2/3Y =4 X-1/2Y=7
Click here to see answer by jim_thompson5910(28715)

Question 183034: HELP, I think the answer is Infinite number of solutions. Is that right? Use elimination to solve each system of equations. Y=2X+9 2X-Y=-9
Click here to see answer by ptaylor(2052)

Question 183033: HELP, I think the answer is x=7 and y=7 but how do you set this up. Use elimination to solve each system of equations. 4X-2Y=14 Y=X
Click here to see answer by jim_thompson5910(28715)

Question 183032: HELP, I think the answer is no solution. Is that right, if not please show my how to do it. Use elimination to solve each system of equations. X=4Y+8 2X-8Y=-3
Click here to see answer by jim_thompson5910(28715)

Question 183042: Solve the equations for x and y or state that
there is no solution.
x + y = 4
2x + 3y = -7

Click here to see answer by jim_thompson5910(28715)

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