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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 522071: A challenge for us, maybe not for you!!!!
how to develop the following:
3power of X = 3 power of x-1 + 7
Click here to see answer by richard1234(5390)

Question 522240: I need help solving this problem
Solve the system by back substitution
3x - 2y - 4z + 2w = 6
2y + 5z - 3w = 7
3z -4w = 0
3w = 15
Click here to see answer by umnikmo(75)

Question 522228: I need help solving this problem
2x + 2y - 4z + w = -5
3y + 4z - w = 0
2z -7w = -6
5w = 15
Click here to see answer by richwmiller(9143)

Question 522786: Solve this system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions.2x-y=0 and 3x+y=5

Click here to see answer by stanbon(57354)

Question 522782: Solve this system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions.
Click here to see answer by richard1234(5390)

Question 522860: 6x-5y=-67
7x+83=y
7m+n=13
m-9n=11
4x+5y=15
-6x+y=37
6x+9y=-33
-3x+y=22
Im suppose to solve using the substition method, I am confused!
Click here to see answer by stanbon(57354)

Question 522286: 3x+7-7y+2x-3y-1 what is that equation?
Click here to see answer by richard1234(5390)

Question 523223: what is the standard form of the equation of the line passing through the point (-2,-2) and perpindicular to the line 3x-5y=-5 ?
Click here to see answer by Maths68(1474)

Question 523539: I need help with linear expressions
-3(2s-5)-15=-3(5s+0)-5
Click here to see answer by rfer(12660)

Question 523549: Hi everyone, I'm stuck on this problem, if someone could I help I would really appreciate it. Thank you :)
The difference between three times a number and another is 2. Their sum is 6. Write a system of equations. Then solve for the numbers by graphing the equations.

I can graph the equation, I'm stuck on figuring out the equation. Thanks!
Click here to see answer by Alan3354(30993)

Question 523644: the line has a slope of -2/3 and passes through (6,12)
Click here to see answer by nerdybill(6959)

Question 523644: the line has a slope of -2/3 and passes through (6,12)
Click here to see answer by oberobic(2304)

Question 523807: solve the following system of equations using the elimination method:
3x+2y=48
9x-8y=-24
Click here to see answer by Maths68(1474)

Question 523977: solve the following system using the substitution method:
y=3x-2
15x-5y=10
Click here to see answer by solver91311(16885)

Question 524081: A sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation.

Later, the sales representative indicates that there are three times as many homes available with the second floor plan than the first. Write an equation that illustrates this situation. Use the same variables used in previous problem.
I know that the first part of the solution is x + y = 56, but after that, I get confused. Please help
Click here to see answer by josmiceli(9680)

Question 524127: The problem asks to solve the system using the substitution method. The equations are: -2x+y=6 and 4x-2y=5. In the book this is number 12, since they only show the answers in the back of the book to the odd numbers I did number 11. I got that right but I can't figure this one out. Could you please show me the steps to doing this problem. Thank you.
Click here to see answer by ankor@dixie-net.com(15652)

Question 524158: Classify the system without solving.
2x+3y=12
x+y=4
Click here to see answer by stanbon(57354)

Question 524215: solve the system of equations by graphing.
3x-18=9y
2x-6y=-12
Click here to see answer by mananth(12270)

Question 524256: determine the set of values of k for which the line 2y=x+k does not intersect the curve y=x^2-4x+7
Click here to see answer by stanbon(57354)

Question 524408: solve using the addition method
x+y=10
x-y=8
Click here to see answer by nerdybill(6959)

Question 524601: I honestly do not know where to begin on this one. I looked in the textbook for an example and could not find one for this setup.
Word problem in a form of a Linear equation.
PROBLEM: For a summer job, Dwayne decides to sell magazine subscriptions. He will be paid $18 a day plus $1 for each subscription he sells. If he works for 25 days and makes $574, how many subscriptions did he sell?
Click here to see answer by richwmiller(9143)

Question 524620: how can i find the slope and y-intercept for 4y+14.2=2.4x-2.6
Click here to see answer by Alan3354(30993)

Question 524629: what is the slope and y-intercept of -x/2 - 6=3/2y
Click here to see answer by oberobic(2304)

Question 524632: how do i write the linear equations in slope -intercept form for 16=0.5x-2y-2
Click here to see answer by stanbon(57354)

Question 524632: how do i write the linear equations in slope -intercept form for 16=0.5x-2y-2
Click here to see answer by oberobic(2304)

Question 525215: how do you find the equation of a line that has the slope and passes through the given point?
m = 2; (3,2)
Click here to see answer by tarungehlot(8)

Question 525325: 4x+5y=6
6x-7y=-20
Click here to see answer by stanbon(57354)

Question 525778: m+n=20
m-n=-4
Click here to see answer by Alan3354(30993)

Question 525855: Is 1/2y=1 a linear equation?
Click here to see answer by jim_thompson5910(28595)

Question 525824: 5.25+x=3.75

Click here to see answer by Tatiana_Stebko(1326)

Question 525824: 5.25+x=3.75

Click here to see answer by dango24(4)

Question 526550: How would you solve these two problems by doing subsitution 2x-3y=9 and 5x+2y=-6

Click here to see answer by Maths68(1474)

Question 526644: x+2y-z=6
-x+y+3z=5
x+2y+2z=9
Im not sure what its called exactly what were working on, but you have to solve for x,y, and z in all of the equations.
Click here to see answer by KMST(1868)

Question 526698: Dear available tutor:
Here is my homework problem I'm trying to solve.
A=a+b+c divided by 3, solving for c. (A=average)
How do we solve?
Click here to see answer by jim_thompson5910(28595)

Question 526886: i am having a difficult time trying to solve:
6x - 9y= 25.5
7y - 3x= -14
i cannot figure out what i need to do to get the x's and y's to line up in order to solve the equation...
Click here to see answer by InfantileBear(2)

Question 527123: 46-(2x+1)<3(x+5)+x
Click here to see answer by jim_thompson5910(28595)

Question 527602: x+y=2
x-y=4
Click here to see answer by stanbon(57354)

Question 527608: Math 150 Find all of the real zeros and write the polynomial as a product of linear factors. Show all work.
x,cubed - 11x,squared - 15x + 325

Click here to see answer by stanbon(57354)

Question 527961: how do you solve systems when their is fractions
Click here to see answer by jim_thompson5910(28595)

Question 527983: graph the linear equation
x+4=0
Click here to see answer by jim_thompson5910(28595)

Question 527922: i am having trouble understanding why a staircase with an 8.5" riser & 9" treads has a slope of 17/18. i know m = rise/treads = rise/run = (y2-y1)/(x2-x1) but i keep getting zero??
Click here to see answer by Alan3354(30993)

Question 528039: How do you solve for y and x ? Like my promblem says solve for y right? So they gave me the promblem 4y + 12 = -3(2x-4), could you help me with this promblem?
Click here to see answer by josmiceli(9680)

Question 528167: Can you please help solve the systems of equations by substitution?
5x+y=8
y=3x
Click here to see answer by Alan3354(30993)

Question 528174: Can you please help me solve/understand the system of equations by substitution? Thanks!

32x-4y=20
y=8x+5
Click here to see answer by solver91311(16885)

Question 528168: Can you solve the system of equation by substitution?
x-8y=-23
5y-2x=2

Click here to see answer by Maths68(1474)

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