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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 973442: can you help me to solve this equation
7x+15=41
Click here to see answer by EdenWolf(517)

Question 973761: How do u work out y +y in algebra

Click here to see answer by rfer(16322)

Question 973886: Determine the slope of a line that has an x-intercept of -2 and y-intercept of 4
Click here to see answer by MathLover1(20850)

Question 974093: Hi, could you please help me with this problem.
Solve:
2x+3y-z=5
2x+2y=7
8x-2y+3z=15
The answers are supposed to be: x = 0.786; y = 2.714 and z = 4.714.
i have gotten to every known number in the universe using all of my limited math skills, but not those three.
Please help.
Click here to see answer by Alan3354(69443)

Question 974139: I have 1/2x -6y = 2 and -x +12y - 8 = 0
Determine the number of Solutions and explain why its that many solutions.
Click here to see answer by josgarithmetic(39617)

Question 974199: A box contains nickels, dimes and pennies worth $6.20. The number of nickels is two less than twice the number of dimes and there is an equal number of pennies and dimes. How many nickels are in the box?
Click here to see answer by lwsshak3(11628)

Question 974248: 4x+2y-z=7;
8x-2y+z=17
Click here to see answer by ankor@dixie-net.com(22740)

Question 974265: x-y=3,3x-2y=10.

Click here to see answer by Boreal(15235)

Question 974333: Need help on how to solve this problem. Please show steps on how to write the linear function...Thank You :)
Write the linear function for the real-world situation described.
Suppose that over a 20 year period, the number of residents of voting age increased at a nearly constant rate of 2.3 million people per year. After 11 years, there were 184.5 million residents of voting age. Model the number of residents of voting age (in millions) V as a function of the number of years y since the beginning of that 20 year period.
Click here to see answer by rothauserc(4718)

Question 974364: Need help on how to find the vertical and horizontal intercepts. Please show steps on how to find them. Thank you :)
In 2009, bestselling fiction books in mass-market paperback editions sold for about $8. At the same time, bestselling fiction hardcover editions sold for about $27. A reader wanted to spend about $110 on new books in some combination of paperback and hardcover editions.�
(a) Determine the vertical and horizontal intercepts of the graph of the implied linear function algebraically. (Let p, the number of mass market paperbacks purchased at the average mass market paperback price, be plotted on the horizontal axis, and h, the number of bestselling fiction hardcover editions purchased at the average bestselling hardcover edition price, be plotted on the vertical axis. Round your answers to one decimal place.)
Click here to see answer by josgarithmetic(39617)

Question 974511: 8z-9-2z=3=0
To get the term containing Z alone on the left side of the equation, what number needs to be added to both sides? Is it 3??
Click here to see answer by Boreal(15235)

Question 974555: What is the equation of a line passing through the points ( 4,3 ) and ( 6,4 )
Click here to see answer by lwsshak3(11628)

Question 974693: You have $85.00 in your bank account and start saving $15 per week. Your friend has $610 and is withdrawing $10 per week. Using substitution, determine the break even point and explain what the solution means. Thank you :)
Click here to see answer by josmiceli(19441)

Question 974863: find a 3-by-3 magic square using the numbers 6,7,8,14,15,16,22,23 and 24

7 _ _
_ _ _
_ 8 _
Click here to see answer by Edwin McCravy(20056)

Question 974735: find the valve of c for which the pair of equations Cx-y=2 and 6x-2y=3 will have infintely many solution.

Click here to see answer by josgarithmetic(39617)

Question 974735: find the valve of c for which the pair of equations Cx-y=2 and 6x-2y=3 will have infintely many solution.

Click here to see answer by MathTherapy(10552)

Question 974927: Marcus is working at a local pizzeria where he makes $12.50 per hour and is also working at the university bookstore where he makes $9.50 per hour. He must make at least $300 per week to cover his expenses but cannot work more than 30 hours per week in order to attend classes. Write a system of inequalities that models this situation where p represents the hours he works at the pizzeria and b represents the hours he works at the bookstore.
Click here to see answer by josgarithmetic(39617)

Question 975204: X=t-4
Y=t/2
Write as a single linear equation
Click here to see answer by Alan3354(69443)

Question 975204: X=t-4
Y=t/2
Write as a single linear equation
Click here to see answer by stanbon(75887)

Question 975360: y=3x-4
3x-2y=13
Solve for (x,y) using substitution
Thank you
Click here to see answer by Boreal(15235)

Question 975363: Solve for (x,y)
y=-3/4x+1/4
y=3/4x-3/4
Thank you!
Click here to see answer by Boreal(15235)

Question 975555: 3x + 2y = -11
x = -11 + 3y
Solve the system by substitution
Click here to see answer by Alan3354(69443)

Question 975597: How would you write x= t-2
Y= 2t
as a linear equation? The so much!
Click here to see answer by Boreal(15235)

Question 975600: How would you rewrite x=1/2t
Y=3t-1
As a single linear equation?
Click here to see answer by Boreal(15235)

Question 975677: Please help me to solve the following equation and sketch it on the graph with explanation so I can understand:
y=3x-4
Y=x-2
Y=2x-3
Y=-2x
Click here to see answer by stanbon(75887)

Question 975686: determine whether or not the equation is linear:
1) 4x-7(x-9)=13x
2) 0.06^2-0.07x=0.90
linear or not linear and if so, why and if not, why
thanks
Click here to see answer by josgarithmetic(39617)

Question 975687: Decide whether the equation is an identity, a conditional equation, or a contradiction. Give the solution set.
6) 5(2x-31)=10x-155
A) Conditional B) Identity (all real numbers) C)Constradiction D)Identity
7) 10x+87 = 2(5x+39)
A) Identitiy; (all real numbers) B) Conditional (5)
C) Conditional (-5) D) Contradiction
Click here to see answer by josgarithmetic(39617)

Question 975762: Solve the following system of equations
y = x^2 + 3
y = x + 5
Click here to see answer by algebrahouse.com(1659)

Question 975786: The line passes through (7,-3) and is parallel to the line whose equation is y=3x+2
Click here to see answer by Fombitz(32388)

Question 975844: Find the numerical value of √(5x+7y) if x=3 and y=7.

Click here to see answer by jim_thompson5910(35256)

Question 975845: Using the formula E = √PR find the value of E when P=8.3 mW and R=27 K ohms. Please round off your answer to nearest whole number. State your answer in (V) volts.
Click here to see answer by solver91311(24713)

Question 975849: The graph
at the right represents the demands for low-income rental housing in the United States and the number of affordable rental units. Use the coordinates given to write a linear system. Solve the system. What does the point of intersection represent in the context of the situation?

Click here to see answer by solver91311(24713)

Question 975855: Y=x-4
Y=4x-10
Solve the system of linear equations using substitution.
Click here to see answer by algebrahouse.com(1659)

Question 976063: solve the equation by the use of substitution method showing all the steps taken in solving equation;
2/5x + 3/2y = 2
7/3x - 5/4y = -5
Click here to see answer by FrankM(1040)

Question 976083: solve for x and y from given equations
3 to the power 3x+1=9 to the power y and x squared+2y=29
Click here to see answer by t0hierry(194)

Question 976251: Solve the initial value problem y'+y/2x=xy^-3,y(1)=2.Please help me.
Click here to see answer by t0hierry(194)

Question 976477: 6y-16=4(y-3)
Click here to see answer by Tatiana_Stebko(1539)

Question 976502: A party rental company has chairs and tables for rent. The total cost to rent
4
chairs and
8
tables is
$57
. The total cost to rent
2
chairs and
3
tables is
$22
. What is the cost to rent each chair and each table?
Click here to see answer by stanbon(75887)

Question 976645: 7y-30=4y+60=5y-14
solve for y
Click here to see answer by FrankM(1040)

Question 976674: (k+5)(4k-9)=
Click here to see answer by Fombitz(32388)

Question 976857: Hello!
I need help solving this:
What is the vertex, axis of symmetry an x-intercepts of f(x)=(x-7)^2+8 ?
Please explain each step thank you.
Click here to see answer by FrankM(1040)

Question 976965: Solve the following system of equations by graphing and select the correct answer below:
3x + 5y = 38
4x − 2y = 16
Click here to see answer by MathLover1(20850)

Question 977026: 3y-4+(-6y+2)=22
Click here to see answer by Horlaye(27)

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