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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 249193: what work needs to be shown in hte problem stating, "determine the value of k for which the system of linear equations has no solution."
4x + 5y=12
8x + ky=13
Click here to see answer by ankor@dixie-net.com(22740)

Question 249406: solve the equation.
3/y=y/5y-12
Click here to see answer by checkley77(12844)

Question 249406: solve the equation.
3/y=y/5y-12
Click here to see answer by richwmiller(17219)

Question 249406: solve the equation.
3/y=y/5y-12
Click here to see answer by user_dude2008(1862)

Question 249574: The sum of 2 numbers is 87. If twice the smaller number is subtracted from the larger number, the result is 12. Find the two numbers. How do I solve it step by step?
Click here to see answer by chosenpoint(26)

Question 249679: The solution set for the system 6x+9y=15 and 4x+6y=10 is best described as:
a) undefined
b) x=1, y=1
c) {(x,y)|y=(-2/3)x + (5/3)}
d) inconsistent
e) set of all points
Click here to see answer by richwmiller(17219)

Question 249692: What is two solutions for (-3,2) and cannot use vertical or horizontal lines?
Click here to see answer by richwmiller(17219)

Question 249783: if the points (3, r) and (r, -1) lie on a line with slope -3/4, wat is the value of r?
Click here to see answer by nerdybill(7384)

Question 249778: if the points (3, r) and (r, -1) lie on a line with slope -3/4, wat is the value of r?
Click here to see answer by mathhub(11)

Question 249868: Suppose you bought supplies for a party. Three rolls of streamers and 15 party hats cost $30. Later, you bought 2 rolls of streamers and 4 party hats for $11. How much did each roll of streamers cost? How much did each party hat cost?
Click here to see answer by stanbon(75887)

Question 249934: Solve system by elimination:
-x+t=-1
2x-y=0
Click here to see answer by Alan3354(69443)

Question 249994: Solve each system by substitution. Check your solution.
19.
a-1.2b=-3
0.2b+0.6a=12
Click here to see answer by checkley77(12844)

Question 249994: Solve each system by substitution. Check your solution.
19.
a-1.2b=-3
0.2b+0.6a=12
Click here to see answer by richwmiller(17219)

Question 249937: Solve system by elimination:
3x-2y=-1
3x-4y=9
Click here to see answer by checkley77(12844)

Question 250006: Solve each system of inequalities by graphing
x+8/3y=12
1/2x+4/3y=5
I tried x+8/3y=12 .5x+4/3y=6
-x -x -.5x -.5x
3(8/3)y=(-x+12)3 3(4/3y)=(-.5x+6)3
8y=-3/8x+36/8 4y=-1.5x+18
y=-3/8x+4.5 /4 /4
y=-1.5/4x+4.5
Click here to see answer by stanbon(75887)

Question 250113: how would the equation:
10(62+4y)/5+3y=84 simplify to (-25)y=-200
?
Click here to see answer by stanbon(75887)

Question 250122: Hi my teacher wants us to determin what each linear graph is, But I have always had trouble with linear equations I was wondering if you could just send me an example of the three different graphs and an explantion for each (independant, dependent, and inconsistent). So I can try to do it myself. thank you so much!!
Click here to see answer by stanbon(75887)

Question 250047: Use substitution to solve the linear system
The value of your EFG stock is three times the value of your PQR stock. If the total value if the stocks is $4500, how much is invested in each company?
Click here to see answer by richwmiller(17219)

Question 250169: Use the Substitution method to solve the system of equations.
x + y = 10
y = x + 8
Click here to see answer by richwmiller(17219)

Question 250220: If a line contains the point (0, -1) and has a slope of 2, then which of the following points also lies on the line?
(2, 1)
(1, 1)
(0, 1)
Click here to see answer by solver91311(24713)

Question 250227: In a 3-by-3 linear system, there should be a tripled pair for the system.
This system being:
3x+3y+6z=9
2x+y+3z=7
x+2y-z=-10

what would be the work in solving this? I figured out the tripled pair, but my work doesn't seem to match up exactly. Would you please help me with this problem? At least start me off, so I can finish it!
Click here to see answer by stanbon(75887)

Question 250243: 3x+3y+6z=9
2x+y+3z=7
x+2y-z=-10

I was provided work for this problem using the matrix method. Unfortunately, I am not familiar with that method. Thanks for the help though.This is a 3-by-3 system of inequalities. In order to find the tripled pair, I need to use either the substitution of linear combination(elimination)method.
I figured out the ordered pairs, but work doesn't match up exactly.
Please help!
thank you!
Click here to see answer by Alan3354(69443)

Question 250168: Use the Substitution method to solve the system of equations.
3x + y = 5
4x - 7y = -10
Click here to see answer by checkley77(12844)

Question 249790: A rectangle is five times as long as it is wide. If it were 24 cm shorter and 24 cm wider, it would be a square. What are its dimensions?
Click here to see answer by ankor@dixie-net.com(22740)

Question 250462: find the equation of the line through (3,5)(8,15) write the answer in standard form using only integers
Click here to see answer by edjones(8007)

Question 250498: 3x-(2y+1)=(2y+1)+3x
eadahua@yahoo.com
Click here to see answer by MRperkins(300)

Question 250464: -x/3 = 1/4 solve for x
Click here to see answer by MRperkins(300)

Question 250469: the line contains the point (-2,3) and is perpedicular to y=2x+7. Find the equation and write answer in slope intercept form.
Click here to see answer by actuary(112)

Question 250436: Solve nonlinear system by substitution.
x^2+y^2=25
x^2-y=5
Click here to see answer by Fombitz(32388)

Question 250449: 9x+5y=-33
Click here to see answer by Fombitz(32388)

Question 247304: Is 1/2y=1 a linear equation?
Click here to see answer by Alan3354(69443)

Question 250871: y=5x
Click here to see answer by College Student(505)

Question 250929: x^2 + xy = 7
x + 2y = 5
slove for x and y
Click here to see answer by MRperkins(300)

Question 250879: how do you solve inequality linear system with y-interccept of 0?
Click here to see answer by MRperkins(300)

Question 250864: solve the equation:
3x - 4y = 9
-3x + 2y = 9

Click here to see answer by Fombitz(32388)

Question 250930: x^2 + xy = 7
x + 2y = 5
slove for x and y
Click here to see answer by Fombitz(32388)

Question 251025: if 12 horses are entered in the derby in how many ways can they finish 1st, 2nd, or 3rd?
Click here to see answer by blwinbbbles(106)

Question 251014: find the maximum value of the objective function z=3x+5y subject to the folloing constraints: x greater than or equal to 2, y greater than or equal to 0, x+y less than or equal to 6.
Click here to see answer by Fombitz(32388)

Question 249635: The sum of 5 and quotient of a number and 3 is -1.
Click here to see answer by richwmiller(17219)

Question 251157: How do I solve and graph this
3x-2y=-24
-3x-y= 6

Click here to see answer by checkley77(12844)

Question 251171: building a walkway of uniform width around 95x65 foot swimming pool. After walkway is complete, you want to build a fence around outter edge of walkway. You have 450 ft of fencing to enclose the walkway. What is the maximum width of the walkway?
Click here to see answer by ankor@dixie-net.com(22740)

Question 251208: You are making flags for the school color guard. Each flag has a red stripe and a 12-inch white stripe. The width of each flag is 3/4 its length. the length is 48 inches. How wide is the red stripe? Write and equation.
Click here to see answer by nyc_function(2741)

Question 251342: I have $21.40 in dimes and quarters. She has a total of 100 coins. How many of each kind does she have?
Click here to see answer by richwmiller(17219)

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