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

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Question 215986: Could you help me solve this inequality
5w+2 < 8w+23
Click here to see answer by drj(1380)

Question 215987: Could you help me with this inequality
7y - 1 >_ 12y+29
the less than sign is underlined thats way i put that line underneathe it
Click here to see answer by rfer(16322)

Question 215902: Find a point that solves all equations algebraically. The equations are:
8x+2y-z=-25
3x-3y+5z=10
-5x+6y-2z=17
I have tried several different times to solve by adding and subtracting the equations to get an equation with two solutions, then add and subtract those to solve for one variable and then be able to fill in a two variable equation to get the next variable and finally stick it all in an original equation to get the last variable. I tried substitution. I end up with really big, really ugly answers that, when plugged in, do not add up right. I don't know what else to try. Thank you for your help.
Click here to see answer by Alan3354(69443)

Question 216082: How would you solve this problem? I need step by step on how it was solved please. 0.3x-0.2y=4
0.4+ 0.5y= -55over 7
What is the solution of the system?
Click here to see answer by stanbon(75887)

Question 216060: If the line 3x+ky=8 is perpendicular to the line 2x-5y=10, what is the value of k?
Click here to see answer by Alan3354(69443)

Question 216060: If the line 3x+ky=8 is perpendicular to the line 2x-5y=10, what is the value of k?
Click here to see answer by Edwin McCravy(20056)

Question 216199: is the line 9x+3y=12 and 27x +9y=37 parallel perpendicular or neither
Click here to see answer by rapaljer(4671)

Question 216201: determine the equation of the line described. Put answer in the slope-intercept form, if possible.
Through (6,-1), parallel to 8x-9y=111
Click here to see answer by bfdccheerleader16(4)

Question 216318: what is the system of linear equations {4x+y=7
{x-2y=13
i am at a loss...
Click here to see answer by ichudov(507)

Question 216477: how do i work this problem 1/4(x-3)+5/6=7/12x+2/3

i am stuck, the lcd is 12 so do i divide 12 on both sides?

Click here to see answer by Alan3354(69443)

Question 216714: In a recent year, Americans spent a total of $35 billion to remodel bathrooms and kitchens. Twice as much was spent on kitchens as bathrooms. How much was spent on each?

I started setting up the problem like this:
x+2x=35 bill.
3x=35 bill.
Then divided both sides by 3. But the answer just doesn't look right.
Click here to see answer by rfer(16322)

Question 216747: 4x+3y=-15, How would you solve this equation with out finding out the values of x and y?
Click here to see answer by rfer(16322)

Question 216820: What does y equal in the equation 3-y=13

Click here to see answer by drj(1380)

Question 216963: 4x+y=7
x-2y=13
Click here to see answer by drj(1380)

Question 217067: I have to come up with my own system of equations with two variables (x,y). I am starting with a word problem first.
I drive 10 miles to school and 10 miles back. I go to school 4 days a week and gas costs $2.49. How many miles and how much gas do I use in one week?
I hope you can help me solve this. I made it up and I hope it works. I also need to graph the problem after it has been solved. Thanks
Click here to see answer by stanbon(75887)

Question 217068: Can someone help me solve the systems of equations?
3x+4y+z=7
2y+z=3
-5xz+3y+8z=-31
Click here to see answer by DRichardson(63)

Question 217053: Hi, I need help with a problem involving systems of linear equations, addition (elimination)method. The answer to the problem is ( 2,1) according to the back of my text book but everything I have tried has resulted in different answers. I would greatly appreciate your help with this one and Thanks.
Here's the problem:
3x-4y=2
4x+3y=1
Click here to see answer by stanbon(75887)

Question 217100: Solve by Cramer's Rule x=dx/d, y=dy/d, and z=dz/d
2x-y+3z=9
x+4y+4z=5
3x+2y+2z=5
I have worked this problem and I know it is not right because of the numbers I am getting. I do have that D is -40. I have dx is -20. I have dy is 210 and dz is 156. Something is not right in the way I set up teh matrix. Thanks for your help.
Click here to see answer by Alan3354(69443)

Question 217255: I have to write a system of equations that can be used to solve this problem then solve the system and determine the answer. The problem is:
A lady can join a small business as a full partner and receive a salary of 12,000 a year plus 15% of the year's profit, or she can join as a sales manager with a salary of 27,000 per year plus 5% of the year's profit. What must the years profit be for her total earnings to be the same whether she joins as a full partner or as a sales manager?
I'm not sure if it's right or not but I came up with:
s=0.15p+12,000
s=0.05p+27,000 and what system should I use to solve it?
Click here to see answer by rfer(16322)

Question 217292: Im trying to figure out how to solve this problem. Im not sure how to slove the systems of equations graphically.
y=3x-12
y=4x+2
Click here to see answer by checkley77(12844)

Question 217292: Im trying to figure out how to solve this problem. Im not sure how to slove the systems of equations graphically.
y=3x-12
y=4x+2
Click here to see answer by stanbon(75887)

Question 217254: solve the system of equations 2r+2s=50 and 2r-s=17
Click here to see answer by checkley77(12844)

Question 217289: Consider the following.
g(y) = 7 − 2y
Evaluate the function at each specified value of the independent variable and simplify. (If the function is undefined at the specified value, enter UNDEFINED.)
(a) g(0)

(b) g(7/2)

(c) g(s + 2)

Click here to see answer by RAY100(1637)

Question 217334: Consider the following.
Point Slope
(5, 2) m = -2
Find the slope-intercept form of the equation of the line that passes through the given point and has the indicated slope
Click here to see answer by drj(1380)

Question 217534: Please help me solve this expression: 3(x+6)-2x=
Click here to see answer by checkley77(12844)

Question 217540: Hi! Given a sequence like this:
when n=1, x=1
when n=2, x=5
when n=3, x=9
when n=4, x=13
... and so on, how do you come up with an equation to represent that relationship? I know the answer is 4n-3=x because I looked it up in the back of the book. But how do you figure that out on your own?
Please help! thank you!
cherilyn
Click here to see answer by scott8148(6628)

Question 217607: A circle has a circumference of 48 pie inches. Find its radius.
Click here to see answer by rfer(16322)

Question 217605: Two sides of a triangle are 3 feet and 6 feet longer than the third side of the triangle, respectively. If the perimeter of the triangle is 36 feet, find the length of each side.
Click here to see answer by rfer(16322)

Question 217604: The third side of an isosceles triangle is 2 inches shorter than each of the other two sides. If the perimeter of this triangle is 67 inches, find the length of each side.
Click here to see answer by rfer(16322)

Question 217751: Area of painting: A rectangular painting with a width of x centimeters has an area of x^2 + 50x square centimeters. Find a binomial that represents the length. Area = x^2 + 50x cm^2
Click here to see answer by stanbon(75887)

Question 217789: Use the intercept method to graph x-y=3. help
Click here to see answer by drj(1380)

Question 217868: Find an equation of the linear function f using the given info... m=4,b=1, formula is y=mx+b
Click here to see answer by checkley77(12844)

Question 218217: Of the 38, 123 ofices, stations, and branches of the US Postal service in 2001, 27,876 were actually classified as post offices. What percent to the nearest tenth were classified as post offices?
Click here to see answer by stanbon(75887)

Question 218232: Hi this is a system of equations with 3 variables.
4x-3y-2z=-5
3x+2y+7z=9
-2x+5y+8z=1
What are the values for x, y, and z? Thank you.
Click here to see answer by Alan3354(69443)

Question 218279: give the corrdinates of intersection of the linear equations
2x+y= -4
4x+2y=-8
Click here to see answer by jim_thompson5910(35256)

Question 218322: I'm trying to solve by elimination but the answers just don't seem right?
#1) 5x-7y=-16 10x-14y=32 5x-7(-7.90)=-16
2x-5y=11 10x+25y=-55 5x+55.3=-16
11y=-87 -55.3 -55.3 (-14.26,-7.90)
y=-7.90 5/5x = -71.3/5
x = -14.26
#2) 5x-9=7 7y-3x=-5
+9 +9 7y-3(16/5)=-5
5/5x=16/5 7y-42=-5 (16/5, 37/7)
x = 16/5 +42 +42
7/7y = 37/7
y = 37/7
#3) 9x+5y=6 2(3/11)-5y=-3
2x-5y=-3 6/11-5y=-3
11/11x = 3/11 -6/11 -6/11
x = 3/11 -5/-5y=-27/-5
y = -27/-5
#4) 8x-3y=16 (8/16,-4)
8x+3y=-8
Thanks.
Click here to see answer by Alan3354(69443)

Question 218387: Substitution method
y=-3x+13
2x+9y=-8
Click here to see answer by jim_thompson5910(35256)

Question 218401: System by graphing
2x+y=10
6x+3y=30
Click here to see answer by drj(1380)

Question 218405: Substitution method
y=-3x+13
2x+9y=-8
Click here to see answer by Fombitz(32388)

Question 218485: please help me with these 2 questions!
question 1.
write an equation in slope-intercept form
passes through(4,7) perpendicular to the line that passes through (3,6) and (3,15)
qustion 2
write an equation in slope-intercept form
passes through(1,-1) parallel to the line that passes through (4,1) & (2,-3)
Click here to see answer by checkley77(12844)

Question 218681: Consider the following equation of a line.
2x + 3y − 6 = 0
(a) Find the slope and y-intercept (if possible) of the line specified by the equation. (If an answer is undefined, enter UNDEFINED.)
m = ?
(x,y)=?

Click here to see answer by drj(1380)

Question 218678: Find the slope-intercept form of the equation of the line that passes through the given point and has the indicated slope.
Point (3,5) Slope m=3/5
y=?
Click here to see answer by drj(1380)

Question 218680: Find the slope-intercept form of the equation of the line that passes through the given points.
(2, 2)
(6, -2/3)
Click here to see answer by drj(1380)

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