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Tutors Answer Your Questions about Linear-systems (FREE)
Question 13544: im not quit sure what cat. this question would go under so i tried to find the closes one...i apologize if it is off topic...
a 40 ft. board is to be cut into two peices. The LONGER PIECE is to be 7 feet longer than twice the SHORTER peice. How long is each peice?
let x= shorter peice
___=the longer peice
equation:
Click here to see answer by LilSkittleMd(119)   |
Question 13536: Hi Tutors:
I am working on systems of equations in three variables. I worked up to the point where I solved for Y. I found Y to be -45/119 . I would like some help because working with these kinds of fractions make me real nervous. Please help me? Here is the problem. 2x+y+2z=11 3x+2y+2z=8 x+4y+3z=0 Thank you SAN ANTONIO
Click here to see answer by LilSkittleMd(119) |
Question 13638: x+(x-10)+1/2x=180
to solve this problem we will use simple algebra
that is
x+x-10+1/2x=180
2x+1/2x=180+10
taking lcm
(2x(2x)+1)/2x=190
(4x^2+1)/2x=190
by cross mutiplication
4x^2+1=190*2x
4x^2+1=380x
4x^2-380x+1=0
now we can do it either by qudratic formula
or completing square method
Click here to see answer by baigshahib(11) |
Question 13795: Could you show me all workings to solve this equation:
y/3+3=12-2y
solution
we will bring the variables on one side
that is
y/3+2y=12-3
we will now take lcm
(y+2y(3))/3=9
(y+6y)/3=9
7y=9*3 (by multiplying 3 on both sides of the equation)
7y=27
y=27/7 answer
Click here to see answer by baigshahib(11) |
Question 13772: I just can't figure this out no matter how I try. I am to find an intersection point(if there is one) and graph, shading the appropriate areas.
y>=-1/2x + 1 and 2x-3y>=3. I need to know a step by step solution. I don't know what they are asking for. This is confusing to me. Any help would be appreciated.
Click here to see answer by longjonsilver(2297)  |
Question 13955: I need some help on solving this problem: The vertical blue stripe in the bristles of the toothbrush wears down linearly to half its original length in 90 days of regular use. After the toothebrush has been used regularly for 2 weeks and 4 days, what fractional part of this blue stripe still remains??
The choices are A) 1/10 B) 1/5 C)2/5 D)3/4 E)9/10
I need some help with this...thank you...its greatly appreciated!
Click here to see answer by rapaljer(3625) |
Question 14163: okay...i recently had a test and on this test it stated 8 more than 3 times a number is 62 find the numbers
let x =the number
equation____________________
solve
i tired to do it my self and like always...my answer was wrong...
i came up with the answer 18.4
Click here to see answer by elima(1433) |
Question 14575: Hi Tutors:
I have working on this problem for some time but I am still having a hard time working this one:
I am suppose to solve this system using elimination method
10x+6y+z=7 (1)
5x-9y-2z=3 (2)
15x-12y+2z=-5 (3)
20x-21y=-2 (4)
Please show me how to work this problem from this point.
Thank you
Click here to see answer by venugopalramana(3286)  |
Question 14972: Hi I need help with a couple of problems. I need to solve these system of equations by graphing and I don't know how. The problem is x+y=5
2y=x-2
that is the same problem. I just need to know how to show the steps to solve it and graph it.
Click here to see answer by jb007mi6(53) |
Question 15084: i dont understand these guestions..can i please get some help
2. a) David works part-time for a bike repair shop. He earns $1 for each tire he installs and $4 for each gear mechanism he assembles. If he did a total of 50 insatallations and assemblies and earned $92, how many tires did he install?
b) A car rental angency rents cars under two plans:
Plan 1: $55 per day and $0.10/km
Plan 2: $40 per day and $0.25/km
Determine when both plans will result in the same charge for a one-day rental.
Click here to see answer by bam878s(76) |
Question 15091: I am having trouble finding how to write the equation with certain given points..
Please help me
The questions are:
Write the equation of the line with slope m=4 that passes through the point (2,1).
Write the equation of the through (4,-3) with the slope m=-2/3.
Write the equation of a line that passes through the points(5,4) and (6,9).
Write the equation of a line that passes through the points (-7,-4) and (3,-5)
Write the equation of the line through (-2,0) and (0,3)
Please help me figure out how to do these, I am stuck and truely need your help asap.
Thanks MelMel
Click here to see answer by bam878s(76) |
Question 15091: I am having trouble finding how to write the equation with certain given points..
Please help me
The questions are:
Write the equation of the line with slope m=4 that passes through the point (2,1).
Write the equation of the through (4,-3) with the slope m=-2/3.
Write the equation of a line that passes through the points(5,4) and (6,9).
Write the equation of a line that passes through the points (-7,-4) and (3,-5)
Write the equation of the line through (-2,0) and (0,3)
Please help me figure out how to do these, I am stuck and truely need your help asap.
Thanks MelMel
Click here to see answer by Earlsdon(4900) |
Question 14481: i need help solving these 2 linear equation problems. they both must be solved using elimination only.
1. x - 6y = 3 2. 6x + -4y = 12
3x+ 2y = 1 9x - 6y = 18
These 2 problems must b only solved using elimination. please i need help i tried i feel like its wrong
Click here to see answer by venugopalramana(3286) |
Question 15519: Please solve the following system of equations:
x + y = -1
1/x + 1/y = 1/2
I've tried cross multiplying and all sorts to eliminate one of the unknowns, but have just made things worse.
Please help.
Click here to see answer by vasu2qute(17) |
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