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

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Question 618509: Hi, I try to solve for a,b,c but do not know how to get them. Thank you
x,y,xy, x^2 y, n are all just numbers. thank you

Y = na+bx1+cx2
XY = ax1+bx2+cx3
X^2 Y = ax2+bx3+cx4

Click here to see answer by swincher4391(1107)

Question 618719: will you please solve the system of equations?
5x + y = 24 and x + 3y = 2
Click here to see answer by Alan3354(69443)

Question 618958: solve
y=2x-1
2x-y-1=0
---
So far i have done
2x-y-1=0
+y
2x-1=y
But it's the same equation as the top one. Could you please tell me how to solve this system?

Click here to see answer by mananth(16946)

Question 619054: Please help!
I simplified (3+i)^2 and got 9-1 but it was wrong.
thanks
Click here to see answer by Alan3354(69443)

Question 619052: Please Help!
"the graph of x+3y-2z=20 contains which point?"
A. (0,10,5)
B.(2,6,2)
C.(6,8,5)
D.(0,0,-10)
I had A as my answer and it was wrong.
Thanks so much!
Click here to see answer by Alan3354(69443)

Question 619141: Whats the answer to .25x+.05(8-x)=.10(36)
Click here to see answer by IFY(62)

Question 619141: Whats the answer to .25x+.05(8-x)=.10(36)
Click here to see answer by MathTherapy(10552)

Question 619345: Factor the trinomial
18r^3-39r^2+20r
Click here to see answer by sophxmai(62)

Question 619374: five years ago i was thrice as old as my son and ten years later i shall be thrice as old as my son. what shall be the present age of us?
Click here to see answer by stanbon(75887)

Question 619457: 9x + 2y = -48
Click here to see answer by jim_thompson5910(35256)

Question 619557: Solve the equation or formula for the indicated variable.
S = 5r^2 t; for t
Click here to see answer by stanbon(75887)

Question 619560: What inequality represents the sentence? The product of a number and 5 is no more than 8.
Click here to see answer by stanbon(75887)

Question 619555: Evaluate the expression for the given value of the variable(s).
-x^2 - 4x - 4; x = -3
Click here to see answer by stanbon(75887)

Question 619551: Is the inequality sometimes, always, or never true? -2(2x + 9) > -4x + 9
Click here to see answer by stanbon(75887)

Question 619551: Is the inequality sometimes, always, or never true? -2(2x + 9) > -4x + 9
Click here to see answer by jim_thompson5910(35256)

Question 619662: Use the equation 2x+y=12 what is the missing numbers in the ordered pairs ?

Click here to see answer by ewatrrr(24785)

Question 619661: 2x+y=12 what is the missing numbers in the ordered pairs ?

Click here to see answer by ewatrrr(24785)

Question 619777: How to verify that the values of the variables listed are solutions of the system of equations?
{█(x+y=2@x-y= -10)┤
X = -4, y = 6
replace your variables with your values:
x+y = 2 becomes -4 + 6 = 2 which is a true statement
x-y + -10 becomes -4 (+) -6 = -10 which is also a true statement
Click here to see answer by TSloan(1)

Question 620218: graph the linear equation by solving for y first
2x+3y=-15
Click here to see answer by Alan3354(69443)

Question 620215: x + y = 4k
2x = k
where k is a constant Real Number, solve the system for (x; y) in terms of k. Give your
solution as an ordered pair.
Click here to see answer by ewatrrr(24785)

Question 620217: using substitution: x=-y-1 and x-y=-11
Click here to see answer by math-vortex(648)

Question 620290: How would I solve this equation using multiplication with the addition method? Also by using elimination..not substitution.
5x - 2y = 4
3x + y = 9
Click here to see answer by math-vortex(648)

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(69443)

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(11628)

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(2983)

Question 620470: W/4-35=-20
Click here to see answer by ewatrrr(24785)

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(2983)

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(16322)

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(69443)

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(24785)

Question 620825: x+y=5
2x+y=8
Click here to see answer by lynnlo(4176)

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(24713)

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(24713)

Question 622227: 2x+3y=-1
x=-2y
find x and y
Click here to see answer by lynnlo(4176)

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(24785)

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(24785)

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(24785)

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(24785)

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

Click here to see answer by ewatrrr(24785)

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(24713)

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(648)

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