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

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Question 620312: what is the full solution of the linear equation using the elimination method?
x+3y+3z+-1
2x-y+z=-3
x-2y=3z=9

Click here to see answer by Alan3354(30993)

Question 620375: $2.77 in a coin jar- all pennies(x), nickels(y), and dimes(z). If there are 53 coins in all, and 4 more nickels than dimes, how many of each coin do you have.
Click here to see answer by lwsshak3(6505)

Question 620409: What is the answer in graphing the system of linear inequalities on y<-3x+2 and y>4x-1 by giving two ordered pairs that are solutions and two that are not solutions?
Click here to see answer by vleith(2825)

Question 620470: W/4-35=-20
Click here to see answer by ewatrrr(10682)

Question 620526: When you do the substitution method and you just have variables to add and subtract with..Like for example.
x+y=3
x-y=1
How do you solve that?
Click here to see answer by vleith(2825)

Question 620593: graph the solution of y-2>1 on a number line (linear inequalities)
i know how to graph it
what i don't know is how to calculate y-2>1

Click here to see answer by rfer(12660)

Question 620679: Its Telling me to solve this equation. i dont understand how to work this problem out i know i have to get a on one side to find out what it represents but i tried and dont get no where .
(5/4)(2a-10)=(-3/4a)
Click here to see answer by Alan3354(30993)

Question 620761: If you wanted to which equation could you use?
A. y = 4x + 11
B. y = 4x + 3
C. y = x + 7
D. y = -4x + 7

Click here to see answer by ewatrrr(10682)

Question 620825: x+y=5
2x+y=8
Click here to see answer by lynnlo(4164)

Question 620825: x+y=5
2x+y=8
Click here to see answer by tweety12(1)

Question 620903: how do yu solve this problem 77=-5p+2
Click here to see answer by solver91311(16885)

Question 607867: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
6x – 4y = 19
24x - 16y = -76
Click here to see answer by sunsetatdawn(4)

Question 620935: How can equations and inequalities help a business maximize profit or minimize costs?
What is the importance of understanding how to set up and solve wquations and inequalities?
Click here to see answer by solver91311(16885)

Question 622227: 2x+3y=-1
x=-2y
find x and y
Click here to see answer by lynnlo(4164)

Question 622320: use the confficient to define w/c system hand one sol'vn infinitely many or no solution

1) 2x+y=10
2x-3y=5

2) 4y-6x=1
2y-3x=4
3) x+y=2
2x+2y=4
4) 4x+5y=12
2x-y=6
5) y=3x-5
-6x+2y=-10
Click here to see answer by ewatrrr(10682)

Question 622346: If the profit equation is P=-x^2+33x-200, what would be the profit on 25 tile sets?
Click here to see answer by ewatrrr(10682)

Question 622349: Could someone please double check my work please,
f. What is the profit made from selling 20 tiles per month?(answer- worth 3 points - must show work)
P(20)=-20^2+(33*20)-200
P(20)=400+660-200
P(20)=460
The profit made from selling 20 tile sets per month is $460.00
g. What is the profit made from selling 25 tiles each month?(answer- worth 3 points - must show work)
P(25)=-25^2+(33*25)-200
P(25)=625+825-200
The profit made from selling 25 tile sets is $1250.
Click here to see answer by ewatrrr(10682)

Question 622360: Find the midpoint coordinates of the segment that connects the following given points:

(4, -3) and (0, -3)
(4, 4) and (4, 0)
(7, -7) and (9, -7)
(-3, 4) and (-8, 4)
(-4, 2) and (-4, 0)
(2, 6) and (2, 2)

(-18.7, -19.9) and
(-10.5, -6.3)
(8, a + 7) and (5, a + 11)
(d - 5, -4) and (d - 3, -6)
(-4, -8) and (-4, -13)
(-14, -17) and (-10, -30)
(-21, 21.9) and
(-17.8, 20.2)

Click here to see answer by ewatrrr(10682)

Question 622357: 3x-2y=0, x+2y=8

Click here to see answer by ewatrrr(10682)

Question 622415: The average home price in Linden Hills, Minneapolis in 2007 was $381,000. The average home price in Linden Hills, Minneapolis in 2011 was $296,000
Source: http://www.zillow.com/local-info/MN-Minneapolis-home-value/r_5983/
Let year be the x variable and the home price be the y variable.
Generate a linear function that relates year (x) to home price (y).
Estimate what the average home price was in 2009.
Estimate what the average home price will be in 2035. Discuss your answer.
If this trend continues, estimate what year you would predict the average home price will reach $250,000.
Describe in your own words, what the slope of this function tells you.
Give another example where you might use a linear representation to model change over time.
Hint for a- f: You have two points and you are generating the equation of a line given two points. Your points are of the form (x, y) or more specifically (year, home price).
Click here to see answer by solver91311(16885)

Question 622358: Solve the following systems of equations and state if any lines are parallel

1. y + 4x + 5 = 2
y + 3x = 2
2. y + 7x + 6 = 0
y = 2x + 30
3. -6x + 0 = y
6y -12x + 126 = 30
4. 9x - 8 = y
8x - 4 = y
5. y - 8x = 7
y - 8x - 7 = 0
6. y - 3x - 3 = 0
y - 5x + 15 = 0
1. y - 5x + 0 = 0
y + 1x = -24
2. y = 1x + 5
-7x + 45 = y
3. y - x -1 = 0
y = -6x - 41
4. y - 3x - 18 = -10
-6x + 71 = y
5. 0x - 3 = y
y + 8x + 27 = 0
6. 5x + 5y = y
y = -4x + 50

Click here to see answer by math-vortex(472)

Question 622726: With a y-intercept 10, x-intercept 2, and equation of axis of symmetry x-3 = 0, find the graph equation in standard form.
So I've got two points (0, 10) (2, 0) and half of the vertex (3, k). I don't know how to get this.
The equation is y = a(x-h)^2 + k
Either of the two points could be labelled x and y. I'll use the x-intercept (2, 0). The vertex is used for h, k.
So I've got 0 = a(2 - 3)^2 + k
Two unsolved for variables. Not sure what to do.
Click here to see answer by ewatrrr(10682)

Question 622748: Find an equation of the line having the given slope and containing the given point. m=5, (4,1) The equation of the line in slope intercept form is y=
There parts I understand and some I do not. Here is what I attempted to do to solve the problem
m= 5, (4, 1)
m=5 and y intercept (4,1)
m=5 and b=1
y=4 times x +1 (this is the part I did not understand)
y=1
Click here to see answer by Alan3354(30993)

Question 622691: Write the equation in slope-intercept form of the line that has a slope of 2 and contains the point (1, 1)
Click here to see answer by ewatrrr(10682)

Question 622631: During the second game of the 2002 Western Conference finals, the Los Angeles Lakers scored a total of 90 points, resulting from a combination of three-point baskets, two-point baskets, and one-point free-throws. There were 11 times as many two-point baskets as three-point baskets and five times as many free-throws as three-point baskets. What combination of scoring accounted for the Lakers 90 points?
Click here to see answer by math-vortex(472)

Question 622782: why should we clear fractions when solving linear equations and inequalities.
example
Click here to see answer by Edwin McCravy(8909)

Question 622447: y=4x+4
3x+2y=12
solve this as a linear equation and graph. don't know how to answer this. please help.
Click here to see answer by KMST(1868)

Question 622956: -2 = -8 + 2x
Click here to see answer by lynnlo(4164)

Question 622980: Find the value of (g • f)(7) if f(x)=3x-4 and g(x)=3x+1...
Click here to see answer by nerdybill(6958)

Question 623069: A salesman marks up the price of everything he sells by 20%. The equation for the sales price, p, is p=1.2w, where w is the wholesale cost. What will be the sales price of a sweater with a wholesale cost of $48?
Click here to see answer by rfer(12660)

Question 623195: I really need help.I need to know the right answer on this problem.
Elimination
1)2x-y=1
x+3y=4
2)8x+5y=13
3x-y=2
Substitution
1)x+3y=4
2x-y=1
2) 4x+2y=5
5x-3y=-2
Equivalent
1)2x+y=3
y-x=0
5x+2y=-10
Click here to see answer by ewatrrr(10682)

Question 623105: 6x+2=3y-4
Find x. How do I solve this?
Thank you.
Click here to see answer by Alan3354(30993)

Question 623176: The sum of the digits of a two-digir number is 12. If the digits are reversed, the new number is 18 more than the original number. Find the original number.

Click here to see answer by lwsshak3(6505)

Question 623270: I have no idea how to do these, but its solving linear systems.
1) 35x+y=20
1.5x-0.1y=18
2) x+(1/3y)=-2
-8x-(2/3y)=4
Would you mind showing the work? as stated before, I have no idea how to do these, so anything to help me understand would be much appreciated. Thank you!

Click here to see answer by lwsshak3(6505)

Question 623354: for the following:
7*(2+3t)^2
I get the answer: 28 + 84t + 21t^2
what am I doing wrong??
Click here to see answer by lenny460(770)

Question 623358: ramon has a horse and a Carabao. the horse is 2/3 as old as the carabao. The difference between their ages is 4 years. How old is the carabao?

Click here to see answer by ikdeep(226)

Question 623357: If 3/4 of Mario's money in the bank is 112.5o, how much is 5/6?
Click here to see answer by rfer(12660)

Question 623324: Length of the rectangle exceeds its breadth by 7cm. if the length is decreased by 4cm. the area of the new rectangle is same as area of the original rectangle. find the length of original rectangle.
Click here to see answer by ankor@dixie-net.com(15652)

Question 623425: I can´t find the way for the solution:
L1 = 0.08a + 0.072b - 0.01c = 0
L2 = 0.072a + 0.18b - 0.05c = 0
Solution:
a = -0.1953c und b = 0.3559c
How do I get to this solution?
Thanks!
Click here to see answer by Alan3354(30993)

Question 623630: Solve the system by elimination.
1) -3x+y=7
4x-2y=3

2) 2x-3y=7
4x-5y=3
Thank you please solve. :)
Click here to see answer by ewatrrr(10682)

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