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

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Question 1085696: (2X+y)(1+4x+3y)-6x(x+y):simplify

Click here to see answer by Fombitz(32388)

Question 1085706: (y+2/4)+ y-3/8= 1/y
Click here to see answer by Fombitz(32388)

Question 1085729: Linear equation must be solved by elimination
2x-y=32
y-5x=13
Click here to see answer by Fombitz(32388)

Question 1085729: Linear equation must be solved by elimination
2x-y=32
y-5x=13
Click here to see answer by rothauserc(4718)

Question 1085729: Linear equation must be solved by elimination
2x-y=32
y-5x=13
Click here to see answer by MathTherapy(10552)

Question 1085729: Linear equation must be solved by elimination
2x-y=32
y-5x=13
Click here to see answer by Theo(13342)

Question 1085789: 3x + 3y + z = -10
X-3y+2z = -10
8x-2y+3z = -28
Click here to see answer by Alan3354(69443)

Question 1085852: 5x+2y=8
3x-5y=11
Click here to see answer by Alan3354(69443)

Question 1085952: For what negative value of k is there exactly one solution to this system of equations
y=2x^2+kx+6
y=-x+4
Click here to see answer by rapture(86)

Question 1085952: For what negative value of k is there exactly one solution to this system of equations
y=2x^2+kx+6
y=-x+4
Click here to see answer by ikleyn(52782)

Question 1085951: For what negative value of k is there exactly one solution to this system of equations?
y=2x^2+kx+6
y=-x+4
Click here to see answer by rapture(86)

Question 1085951: For what negative value of k is there exactly one solution to this system of equations?
y=2x^2+kx+6
y=-x+4
Click here to see answer by ikleyn(52782)

Question 1086091: y varies directly as x and inversely as the square of z. y=32 when x=100 and z=5. Find y when x=3 and z=9.
Click here to see answer by Boreal(15235)

Question 1086142: Becky would like to have at least $100,000 saved for her daughter's college education. If she invests $25,000 in an education account paying 6/25% interest compounded quarterly, will she reach her goal in 16 years?
Click here to see answer by Boreal(15235)

Question 1086355: A chemist needs 500 milliliters of a solutions that is 20% boric acid and 80% water. She combines x milliliters of a 10% boric acid and 90% water mix and y milliliters of a 30% boric acid and 70% water mix.
Find the values of x and y - the milliliters of each bottle she needs to use to obtain her 500 ml of 20% boric acid solution..
Click here to see answer by Alan3354(69443)

Question 1086453: How many liters of water should a chemist mix with 10 liters of a 24% sodium solution to get an 8% sodium solution?
So to line it up, I have:
All L liters.
10*24 + L*0 = (10+L)*10

10L + 24 = 240
10l = 264
26.4... Im doing something wrong and I dont know what.
Please help me. Thank you!

Click here to see answer by Alan3354(69443)

Question 1086509: Graph the equation and identify the y intercept y= -x
Click here to see answer by Alan3354(69443)

Question 1086289: A trapezoid has a base of x and a height of 3 units. If there is also a square with sides measuring x, what formula would be used to calculate the total area of both figures (the ^ sign represents the exponent or power of the number): *
9x
x 2
4x + x 3
1x 2 + 3

Click here to see answer by KMST(5328)

Question 1087041: The sum of two numbers is -7. Four times first number plus twice the second number is -8. Find the two numbers.
Click here to see answer by rfer(16322)

Question 1087063: 2x-5y=12
2y-x=7
According to the system of equations above, what is the value of x-3y?
Click here to see answer by ikleyn(52782)

Question 1087367: I need help writing an equation of the line passing through (3,-9) and parallel to the line of 2x+3y=-12. The equation has to be in both point slope and y intercept form
Click here to see answer by htmentor(1343)

Question 1087439: Solving linear systems with 3 variables
4x - 3y = 1
2y - 3z = 2
3x + 2z = 3

Click here to see answer by Fombitz(32388)

Question 1087439: Solving linear systems with 3 variables
4x - 3y = 1
2y - 3z = 2
3x + 2z = 3

Click here to see answer by Edwin McCravy(20056)

Question 1087591: Hello, I need help!!
The following model represents an optimization problem. Determine the maximum solution by graphing the boundary lines, shading the appropriate region and looking for points of intersection in the feasible solution.
so I need to point this on the graph.. help thanks!!
Restrictions:
XEW
YEW
Contraints:
x > 0
y > 0
5x (greater or equal to) y + 5
x + y (less than or equal to) 25
Onjective function:
A = x + 2y

Click here to see answer by Theo(13342)

Question 1087823: Square root 3x-5 (-) square root 4-7x =0
Both 3x-5 and 4-7x are in the square root (not separate)
Click here to see answer by josgarithmetic(39617)

Question 1087823: Square root 3x-5 (-) square root 4-7x =0
Both 3x-5 and 4-7x are in the square root (not separate)
Click here to see answer by Alan3354(69443)

Question 1087823: Square root 3x-5 (-) square root 4-7x =0
Both 3x-5 and 4-7x are in the square root (not separate)
Click here to see answer by ikleyn(52782)

Question 1087823: Square root 3x-5 (-) square root 4-7x =0
Both 3x-5 and 4-7x are in the square root (not separate)
Click here to see answer by MathTherapy(10552)

Question 1088614: 10x^4y^4+x^2y^2z-3z^2
criss cross factoring

Click here to see answer by Edwin McCravy(20056)

Question 1088681: Subtract.
(8g+7)�(4g+7)

Click here to see answer by Fombitz(32388)

Question 1088769: Solve the system: x + y + z = 3, 2x � y + 3z = 3, x - 2y + 3z = 0
Click here to see answer by Boreal(15235)

Question 1088768: Solve the system: x + y + z = 4, 3x � y + z = 2, y � z = -2
Click here to see answer by ankor@dixie-net.com(22740)

Question 1089084: A piggy bank contains 36 coins that consists of dimes and quarters totaling $5.85. How many quarters are in the piggy bank? In your final answer, include all necessary calculations.
The problem I am having is putting this question in an system of linear equation and in substitution form and graphing it
I first tried x = .36 + y = 5.85 but the calculations dies not come out what am I doing wrong?
Click here to see answer by jorel1380(3719)

Question 1089182: how do I go about solving linear equations: -x-47=4 and x+4y=4. I need to state no solution, unique or infinity? I was trying to use calculator but it wouldn't let me enter a -x value.
Click here to see answer by stanbon(75887)

Question 1089423: he spent $44 on 13 cases of juice and 9 cases of soda, which is all the store had in stock. A few days later he returned to the store and purchased an additional 10 cases of juice and 9 cases of soda, spending a total of $38. What is the price of each drink? solve algebraically
Click here to see answer by ikleyn(52782)

Question 1089440: 3x-y=2
7x-2y=9
Click here to see answer by Alan3354(69443)

Question 1089492: 4x+7y=-2
6x-8y=5
Linear equition using substitution

Click here to see answer by ikleyn(52782)

Question 1089491: 4x+7y=-2
6x-8y=5
Using substitotion

And
Ellimination
Click here to see answer by ikleyn(52782)

Question 1089533: Can i need ur help for this problem....thank you for the help.....😊

4x+7y=-2
6x-8y=5

Using linear equition substitution and illimination

Click here to see answer by rothauserc(4718)

Question 1089653: the monthly cost of a long distance phone plan is a linear function of the total calling time (in minutes) The monthly cost for 51 minutes of calls is 16.99 and the monthly cost for 65 minutes is 18.53. what is the monthly cost for 55 minutes of calls?
Click here to see answer by ikleyn(52782)

Question 1089714: Solve using Cramer's rule
x + y + z = a
x + 2y + 2z = a + b
x + 2y + 3z = a + b + c

Click here to see answer by ikleyn(52782)

Question 1089741: Mr.Caminiti has some money invested at 4% and three times as much invested at 6%.Her total annual income from the two investments is $ 1100.how muxh is invested at each rate?
Click here to see answer by josmiceli(19441)

Question 1089828: Without graphing a problem, how can you tell if two equations are parallel, perpendicular, or neither? The specific equations I am trying to figure out are 3x-5y=12 and 5x+3y=24

Click here to see answer by math_helper(2461)

Question 1090168: Only three magazines (X, Y and Z) are read at an university. 80% of the students read X, 60% read Y and 50% read Z. What is the maximum percentage of students that read exactly two magazines?
Click here to see answer by ikleyn(52782)

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