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

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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(75887)

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(69443)

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(75887)

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(35256)

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(12844)

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(12844)

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(35256)

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(35256)

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(24713)

Question 182625: 3(2x+1)=9-5(2x-3)
Click here to see answer by jim_thompson5910(35256)

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(1513)

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(1513)

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(1513)

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(69443)

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(69443)

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(35256)

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(35256)

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(2198)

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(35256)

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(35256)

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(35256)

Question 183111: Help me for the answer
3x+y=1
2x-y=-6
Click here to see answer by Alan3354(69443)

Question 183107: I have no idea whats going on here?
Click here to see answer by Alan3354(69443)

Question 183235: 4c+3d=-2
8c-2d=12
Click here to see answer by jim_thompson5910(35256)

Question 183252: Can you please help me and identifies if it is one solution,no solution or infinte solution:
3x+y=1
2x-y=-6
Click here to see answer by rapaljer(4671)

Question 183255: help me to answr this this ;
2x+5y=7
3x-2y=1
Click here to see answer by rapaljer(4671)

Question 183258: Use elimination method in solving this;
2x+5y=7
3x-2y=1
Click here to see answer by rapaljer(4671)

Question 183257: Use elimination method in solving this;
2x+5y=7
3x-2y=1
Click here to see answer by rapaljer(4671)

Question 182816: 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(69443)

Question 183262: Use elimination method in solving this;tnx
x+3y=5
2x+y=5
Click here to see answer by jim_thompson5910(35256)

Question 183268: Use elimination method in solving this:tnx
4x-y=8
2x+y=4
Click here to see answer by jim_thompson5910(35256)

Question 183271: Use elimination method
4x-y=8
2x+y=4
Click here to see answer by jim_thompson5910(35256)

Question 183274: y=2x-4
x=1/2y+2
help me to solve this please use elimination method
Click here to see answer by stanbon(75887)

Question 183273: Help me in Solving this :
4x-y=8
2+y=4
Tnx..............

Click here to see answer by stanbon(75887)

Question 183269: Use elimination method:tnx
5x-3y=32
4x+3y=4

Click here to see answer by jim_thompson5910(35256)

Question 183346: Solve using the addition method
2x - 3y = 6
4x = 12 + 6y
Click here to see answer by vleith(2983)

Question 183398: I can not determine the answer to:
13x-3y=-50
{
12x+5y=16
in either the substitution method or the elimination method..
Click here to see answer by jim_thompson5910(35256)

Question 183398: I can not determine the answer to:
13x-3y=-50
{
12x+5y=16
in either the substitution method or the elimination method..
Click here to see answer by solver91311(24713)

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