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

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Question 412052: I am not understanding how to Solve the system of linear equation using matrices
x+y+z=3
2x -z=7
5y+z=4
Can you guide me step by step in solving it?
Click here to see answer by ewatrrr(24785)

Question 412059: I am not understanding how to Solve the system of linear equation using matrices
4x-y+2z=5
2y+z=4
4x+y+3z=10
Can you guide me step by step in solving it?

Click here to see answer by Edwin McCravy(20056)

Question 412278: I need help on solving systems by elimination:
Example of a problem:
x - y = -3
5x + 3y = 1
Click here to see answer by shree840(260)

Question 412278: I need help on solving systems by elimination:
Example of a problem:
x - y = -3
5x + 3y = 1
Click here to see answer by stanbon(75887)

Question 412308: 9x+2y=9

Click here to see answer by mananth(16946)

Question 412383: WORK
3)Two executives in cities 400 miles apart drive to a business meeting at a location on the line between their cities. They meet after 4 hrs. Find the speed of each car if one car travels 20 miles per hour faster than the other does.

Thank you in advance! Hoping for your immediate reply.
Click here to see answer by sudhanshu_kmr(1152)

Question 412382: MONEY AND INVESTMENT
4) Maria has twice as much money invested at 5% simple annual interest as she does at 4%. If her yearly income from these two investments is Php 350, how much does she have invested at each rate?

Thank you in advance! Hoping for your immediate reply.
Click here to see answer by Theo(13342)

Question 412385: A merchant wishes to mix coffee worth Php 18.00 per kilo with coffee worth Php 9.00 per kilo to get 90 kilos of mixture worth Php 12.00 per kilo. How many kilos of the Php 18.00 and 19.00 coffee will be needed?
Click here to see answer by Theo(13342)

Question 412406: The sum of x and y numbers is 20. The difference of the two numbers is 16. If the numbers are x and y, which system of linear equations represents the problem?
Click here to see answer by ewatrrr(24785)

Question 412384: A 90% antifreeze solution is to be mixed with a 75% solution to get 120 liters of a 78% solution. How many liters of the 90% and 75% solutions will be used?

Thank you in advance! Hoping for your immediate reply.
Click here to see answer by stanbon(75887)

Question 412434: Decide whether (-4,2) is a solution of the system.
3x+2y=-8
2x-y=-6
Click here to see answer by ewatrrr(24785)

Question 412461: Please convert the following equation to standard form
y + 4 = 3(x - 5)
Click here to see answer by ewatrrr(24785)

Question 412461: Please convert the following equation to standard form
y + 4 = 3(x - 5)
Click here to see answer by MathLover1(20850)

Question 412521: reducir los terminos semjontes diversas clascis
reduce the terms that are similar various classical
i am living in ecuador with minimal spanish..... above are my directions for the following problem.
3x-2y+4x-5z-x+3y-3z+5y=
savannah
Click here to see answer by Alan3354(69443)

Question 412685: solving for x
4x-3=21
Click here to see answer by Alan3354(69443)

Question 412776: What is the y-intercept of - 9x + y =33 ?

Click here to see answer by edjones(8007)

Question 412776: What is the y-intercept of - 9x + y =33 ?

Click here to see answer by algebrahouse.com(1659)

Question 412775: solve the linear system using elimination:
x+y=5
X-y=3
Click here to see answer by solver91311(24713)

Question 412824: Please show me how to graph the following parallel lines
6X +5Y = 2 and 3X + 2.5Y = -7 and how you came to this conclusion.
Click here to see answer by shree840(260)

Question 412861: What are the steps to solve a system?
Here's the example:
x-2y=-7
5y=5x+20
I Have tried canceling out the -2y and 5y or 5x and x but I didn't get the answer right.
I Need the answer and steps so i know how to do this problem on my own when i have a test.
Please :)
Click here to see answer by stanbon(75887)

Question 412924:
Kindly answer these problems please because i am still quite confused in answering these problem using system of linear equations.
3) Working together, James and Chris painted their gate in 3 hrs. and 20 min. Working alone, Chris woul need 5 hrs. longer than James to finish the job. How long would it take each of them alone to do the job?
Thank you in advance! Hoping for your immediate reply.

Click here to see answer by mananth(16946)

Question 412923: Kindly answer these problems please because i am still quite confused in answering these problem using system of linear equations.
2) A diving pool can be filled by a pipe in 10 hrs. if the drain is open. If the pipe was allowed to run with the drain for 2 hrs. and the drain was closed, it would require the pipe 4 more hrs. to fill the pool. How long would it take the pipe to fill the pool if the drain is closed from the start?

Thank you in advance! Hoping for your immediate reply.

Click here to see answer by sudhanshu_kmr(1152)

Question 412922: Kindly answer these problems please because i am still quite confused in answering these problems and please apply system of linear equations.
1) Working together, Tom and Jerry cleaned the swimming pool in 6 hrs. If both of them worked together for the 1st 3 hrs., and Jerry stopped for an errand it would require Tom 4 hrs. to finish cleaning the pool. How long would it take Jerry to clean the pool alone? How long would it take Tom?

Thank you in advance! Hoping for your immediate reply.

Click here to see answer by ankor@dixie-net.com(22740)

Question 413003: What is the value of y if 2y + 5 = 29
Click here to see answer by rfer(16322)

Question 413385: what is the answer of 75 divided by 226
Click here to see answer by rfer(16322)

Question 413654: Solve by elimination method. 2r - 7s = 4; 7r + 2s = 67
Answer is s=2; r=9, but when giving the answer by ordered pair isn't it (r,s)?
Click here to see answer by richard1234(7193)

Question 413746: hey there i need the answers for (6,-7);m=7/5 and thanks
Click here to see answer by MathLover1(20850)

Question 413738: Subsitution
{2x-3y=-9
3x=yt4
{8x-3y=4
7x=y+3
{6x-3y=5
x+2y=0
{10x-5y=-21
x+3y=0
{3x-y=1
2x-3y=10
{2x-y=-7
4x-3y=-11
**Steps to solving these problems**

Click here to see answer by Alan3354(69443)

Question 413925: suppose y varies directly as the square of x,
a. Find the constant of proportionality if y=4 when x=3. What is x when yis 16?
b. if the constant of variation is 5/8, what is y when x=6? what i x when y= 90?
c. find the constant of variation and the value of y when x=5 if y=2 when x=2
Click here to see answer by ewatrrr(24785)

Question 413927: The surface area of a sphere varies directly as the square of a radius.
a. if the surface area is 16pi when r is 2, find the constant of variation.
b. Find the surface area when the radius is 5.
c. Find the radius when the surface area is 48 pi.
Click here to see answer by ewatrrr(24785)

Question 413931: If y varies directly as x^3 and y =400 when x=10 ,
a. Find y in terms of x.
b. Find y when x=5
c.Find x when y=25 3/5
Click here to see answer by ewatrrr(24785)

Question 414115: carl bought 19 apples of 2 different varieties to make a pie. The total cost of the apples was $5.10. Granny Smith apples cost $0.25 each and Gala apples cost $0.30 each. How many of each type of apple did Carl buy?
Click here to see answer by ewatrrr(24785)

Question 414219: Write an equation in standard form of the line passing through (2,-5) and (-4,7) Thanks. Please answer ASAP for I have a test on monday.
I have tried doing the first y minus second y over first x minus second x to find the slope. I got -2. Then I plugged it in to the slope intercept form. Y =mx +b I plugged in one ordered pair and got the y intercept is equal to -1. I got -2x + y = -1 but the textbook said that the answer was 2x +y =-1
Click here to see answer by mananth(16946)

Question 414333: 3x-2y=-31
5x+-2y=-49
Solve linear systems by adding or subtracting
From Holt McDougal text: Florida Larson Algebra 1
Chapter/Section 7.3 extra practice page 908 problem 15
Click here to see answer by stanbon(75887)

Question 414356: solve for the indicared letter z=11-y,for y
Click here to see answer by MathLover1(20850)

Question 414234: Sarah purchased two picture frames. The perimeter of the larger frame is 240cm, and the perimeter of the smaller frame is 140cm. The height of the smaller frame is the same as the width of the larger frame, and the width of the smaller frame is 10cm less than the height of the smaller frame. Find the dimensions of the larger frame.
Click here to see answer by ankor@dixie-net.com(22740)

Question 414446: write and equation of the line passing through (0,2) that is perpendicular to y= -4x+6
Click here to see answer by rfadrogane(214)

Question 414442: 1) write an equation of the line that is "parallel" to the given line and passes through the given point.
y=2x+2,(3,2)
Click here to see answer by Alan3354(69443)

Question 414554: Need some help please. Huge final due soon.
Solve the following systems of equations
x+9y=8 (1)
x=5-9y (2)
Click here to see answer by algebrahouse.com(1659)

Question 414577: solve the linear system: y=2x+2 equ 1 x+3y=41 equ2
Click here to see answer by mananth(16946)

Question 414848: Fred weighs 187 pounds but is on a diet that makes him lose 1.7 pounds per week. Barney weighs only 93 pounds but is on a diet that makes him gain 0.9 pounds per week. What is the number of weeks it takes for Fred and Barney to weigh exactly the same amount? How many weeks does it take for their total weight to equal 252 pounds?
Click here to see answer by stanbon(75887)

Question 415016: 4x+y=8 x=3y-15
Click here to see answer by woolybear(13)

Question 414942: The perimeter of a triangle is 5 ft. The longest side of the triangle measures 20 in. more than the shortest side. The middle side is 3 times the measure of the shortest side. Find the lengths of the three sides in inches.
so far i have this but I'm not sure if their right
P=5 ft.?
L=S+20?
M=3s?
Click here to see answer by ankor@dixie-net.com(22740)

Question 415418: I need help on a question on homework. Here is the problem:
Write a system of inequalities whose solution is the set of all points in quadrant 1 not including the axes.

Click here to see answer by stanbon(75887)

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