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

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Question 364513: Let f(x)=1+ 4/x and g(x)= 2/x-8
find the composite function (fog)(x) Show work.

Click here to see answer by Fombitz(13828)

Question 364555: A helicopter flew 180 miles 1.5 hours with a tail wind. The return trip took 2 hours with a head wind. What was the speed of the helicopter in still air? What was the speed of the wind?
Click here to see answer by Alan3354(30993)

Question 364606: Okay, im working on solving linear equations by graphing.
here are my 2 problems:
7x+y=-17
and
3x-10y=24
I know that 7x+y=-17 would become y=-7x-17
but how would i solve 3x-10y=24?
Click here to see answer by ewatrrr(10682)

Question 365104: 3x+y =-6
4x +z=0
2y+z=-2
Click here to see answer by Alan3354(30993)

Question 365386: 3x-5y+z=8
47-z+10
7x+y=4
Click here to see answer by Alan3354(30993)

Question 365396: add the fraction q/q2+5q+6 and 1/(q+2)(q+3)
Click here to see answer by mananth(12270)

Question 365371: how do you solve the system of equations with these three equations?
x-y+z=8
x+y+z=6
x+y-z=-12
Click here to see answer by Fombitz(13828)

Question 365377: The chemist wants 100 gallons when complete. He is mixing a 24% solution with a 50% solution to get a 36% solution. How many gallons of each will he use?
Click here to see answer by mananth(12270)

Question 365467: 2 machines produce washers. The 1st machine can produce twice as many washers in one hour than the 2nd machine. If the 1st machine runs 2 hours and the 2nd machine runs 3 hours and 560 washers are produced, how many does each one produce in one hour?
Click here to see answer by ewatrrr(10682)

Question 365681: can you help me ?
y=-4
y=4
about tell the whether the lines for each equation are parallel,perpendicular,or neither

Click here to see answer by Alan3354(30993)

Question 366260: 3r-4s=5
4r+3s=15
Solve by elimination
Click here to see answer by Alan3354(30993)

Question 366314: The length of a rectangle is 3 more than its width. The perimeter of the rectangle is 58 centimeters. What are the rectangle's dimensions?
Directions: Write a system of equations to represent the situation. Then solve the system by substitution.

Please help me!!

Click here to see answer by mananth(12270)

Question 366256: convert x + 1/3 y = 0..... to y=mx+b format
Click here to see answer by robertb(4012)

Question 366327: if a linear function has a y-intercept of b, at what point does its graph cross the y-axis?
Click here to see answer by rfer(12654)

Question 366374: when solving an inequality, how do you know when to switch the sign?
Click here to see answer by nyc_function(2733)

Question 366416: how do I solve using the substituion method with the following equations. 3b-2a=4 and b/2-2a/3=1?

Click here to see answer by mananth(12270)

Question 366476: How do I solve this -x-y=-1 & -x-2y=-10
Click here to see answer by Jk22(389)

Question 366555: without actually solving the equation, list all possible numbers that would be rejected if they appeared as potential solutions. 1/x+5 - 1/x-5= 0
Click here to see answer by amoresroy(333)

Question 366585: system of four linear algebraic equation (get values of A,B, C and D)
0= Acos(t)+Bsin(t)+Ctcos(t)+Dtsin(t)+3t-2
0=-Asin(t)+Bcos(t)+Ccos(t)-Ctsin(t)+Dsin(t)+Dtcos(t)+3
1=-Acos(t)-Bsin(t)-2Csin(t)-Ctcos(t)+2Dcos(t)-Dtsin(t)
1= Asin(t)-Bcos(t)-2Ccos(t)-Ccos(t)+Ctsin(t)-2Dsin(t)-Dsin(t)-Dtcos(t)
Click here to see answer by robertb(4012)

Question 366706: Solve the system of linear equations using any method.
2x + y = 5 and 4x + 3y = 11

Click here to see answer by mananth(12270)

Question 366469: graph the eqautions 3x+5y<=340 and x>=30 and y>=20.
Click here to see answer by Fombitz(13828)

Question 366739: V = πr2h; solve for h. NOTE: THE NUMBER 2 IS AN EXPONENT.
Click here to see answer by mananth(12270)

Question 366716: Given the system of linear equations: y = 2x + 5 and - 2x + y = 7 , which one of the following statements is true
Click here to see answer by solver91311(16872)

Question 366778: Please help me solve this equation:
Solve each system addition. Determine whether the equations are independent, dependent, or inconsistent. Solve each equation by the substitution method.
2x = 2 - y
3x + y = -1
Thank you

Click here to see answer by mananth(12270)

Question 366949: please help me solve this question: 4y+x=8
Click here to see answer by Fombitz(13828)

Question 366884: solve by the substitution method.
9x+3y=-51
-8x+y=49
Click here to see answer by Fombitz(13828)

Question 366946: please help me solve this equation: 6x+4y=8
Click here to see answer by Alan3354(30993)

Question 366974: 4x-6y=3
6x-4y=-3
solve by elimination method

Click here to see answer by jim_thompson5910(28536)

Question 366973: Solve this equation by the substitution method. Help
{2y=x+2
{6x-12y=0
Click here to see answer by robertb(4012)

Question 366973: Solve this equation by the substitution method. Help
{2y=x+2
{6x-12y=0
Click here to see answer by stanbon(57285)

Question 365737: x=15
Click here to see answer by Fombitz(13828)

Question 367113: The Ramapo High School lacrosse team sold brownies and cookies to earn money for a tournament. The brownies sold for $6.00 per box and the cookies sold for $8.00 a box. The total number of baked goods was 580. and the total amount of money collected was $4,340. How many boxes of each kind of baked goods were sold?
Click here to see answer by ewatrrr(10682)

Question 367272: 3x-2y=2
-2x+y=-2
So the answer is (-2,-6) right? And how do you know when consistent,dependent,inconsistent,or dependent? >Thats my main issue.
Thanks
Click here to see answer by jim_thompson5910(28536)

Question 367259: hello, i'm having trouble trying to graph the slope, of y=-7x-1 thank you
Click here to see answer by rfer(12654)

Question 367356: x+2y=8
y=6
Click here to see answer by rfer(12654)

Question 367497: I am having trouble finding the solution to
x+8y=6(1)
x=9-8y(2)
Can you please help this is my final question.
Click here to see answer by robertb(4012)

Question 367496: How do I solve the following systems of equations by using the addition method?
2x-y=3
x-2y=9
Click here to see answer by robertb(4012)

Question 367503: 500 tickets were sold for a certain performance of a play. The tickets for adults and children sold for $7.50 and $4.00, respectively, and the total receipts for the performance were $3312.50. How many of each kind of ticket were sold?
Click here to see answer by rfer(12654)

Question 367575: Will you help me solve for y in the equation: 3x-4y=10
Click here to see answer by robertb(4012)

Question 367546: 10 liters of a 30% acid solution is obtained by mixing 20% solution with a 50% solution.
a) write a system of equations in which one equation represents the amount of final mixture required and the other represents the amount of the acid in the final mixture. Let x and y represent the amounts of 20% and 50% solutions, respectively.
b) use a graphing utility to graph the two equations in part a. As the amount of the 20% solution increases, how does the amount of the 50% solution change?
c) How much of each solution is required to obtain the specified concentration in the final mixture?

Click here to see answer by Theo(3458)

Question 367750: As a restaurant owner there are many decisions that you need to make on a daily basis, such as where to keep inventory levels. You wish to replenish your stock of dishes by purchasing 250 sets for your restaurant. You have two dish design from which to choose. One design costs $20 per set and the other $45 per set. If you only have $6,800 to spend, how many of each design should you order? I need help setting this up.
Click here to see answer by stanbon(57285)

Question 367795: Find the slope and intercepts of the line.
18) 9x + 2y = 49

Click here to see answer by Fombitz(13828)

Question 367864: 4-3(1-x) *is less than or equal to* 3
Click here to see answer by rfer(12654)

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