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

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Question 392024: solve if possible 3x+y+z=0
2x-y+z=0
2x+y+z=0
Click here to see answer by Alan3354(69443)

Question 392024: solve if possible 3x+y+z=0
2x-y+z=0
2x+y+z=0
Click here to see answer by edjones(8007)

Question 392060: Use substitution to determine if the given ordeded pair is an element of the solution set ofr the system of equations

(2,8)
y-2x=4
2y+x=-8
Click here to see answer by rfer(16322)

Question 392280: what is 4x-3=7
Click here to see answer by ewatrrr(24785)

Question 392280: what is 4x-3=7
Click here to see answer by MathLover1(20850)

Question 392308: 15x-5y=-20
-3x+y=4
Click here to see answer by Alan3354(69443)

Question 392341: find an equation of the line containing the given pair of points. Express your answer in the form x =a,y=b or y=mx+b (-1,_1) and (9,9) what is an equation of the line?
Click here to see answer by NancyLam(35)

Question 392474: find the slope-intercept equationof the line that had the given characteristics slope 4 and y- interceot (0,3)
Click here to see answer by rfer(16322)

Question 392474: find the slope-intercept equationof the line that had the given characteristics slope 4 and y- interceot (0,3)
Click here to see answer by stanbon(75887)

Question 392306: A two digit number is 6 times its units digit. Find the number if the sum of its digits is 6.
Click here to see answer by ankor@dixie-net.com(22740)

Question 392464: can u help me with an equation plz the equation is:
x
- - 2=6
2
Click here to see answer by fafa(13)

Question 392668: a ine passes through (3,4)and(4,7)
write an equation for the line in point slope form
rewrite the equation in standard form using integers
Click here to see answer by Alan3354(69443)

Question 392664: carlos and maria drove a total of 280 miles in 5.5 hours. carlos drove the forst part of the trip and averaged 49 miles per hour. maria drove the remainder of the trip and avereged 54 miles per hour. for approximately how many hours did maria drive? round your answer to the nearset tenth if necessary.
Click here to see answer by nerdybill(7384)

Question 392730: elimination
x+3y=14
2x-3y=-8

Click here to see answer by Alan3354(69443)

Question 392730: elimination
x+3y=14
2x-3y=-8

Click here to see answer by ewatrrr(24785)

Question 392775: 7x-(2x-12)=-8
Click here to see answer by stanbon(75887)

Question 392937: Pablo's Pizza pays $8/hour for their delivery persons. Pedro's Pizza pays $6/hour and $1.25 per delivery for their delivery persons. How many deliveries must be made at Pedro's Pizza in order to be paid more for an 8-hour shift?
Click here to see answer by robertb(5830)

Question 393039: 4
-(2x-3)>12
5
Click here to see answer by mananth(16946)

Question 393058: I'm struggling to help my 8th grade daughter with her algebra........
this is one.......the solution to which system of equations has a positive y value? 4 choices are listed but this is the one that's supposed to be correct---
y=3x+3 and 2x+3y=0. I keep coming up with a negative value. Can you help? Thank you!
Click here to see answer by jim_thompson5910(35256)

Question 393082: Please help me solve this problem.

Find all solutions (if possible):
-4x -y + 2z = -6
-x +2y + 3z = -5
2x -4y - 3z = -5

Click here to see answer by Edwin McCravy(20056)

Question 393112: write the equation in standard from of the horizontal and vertical lines that pass through the point (2,4)
Click here to see answer by ewatrrr(24785)

Question 393415: 2/3 of a number is 12
Click here to see answer by solver91311(24713)

Question 393422: Need help with solving this equation
0.3x + 9 ≤ 0.7x - 8
Click here to see answer by mananth(16946)

Question 393422: Need help with solving this equation
0.3x + 9 ≤ 0.7x - 8
Click here to see answer by MathLover1(20850)

Question 393431: how do i write an equation of a line when i am given the point and the slope?
Click here to see answer by stanbon(75887)

Question 393435: Bayside insurance offers two health plans. Under plan A, Giselle would pay the first $50 of her medical bills, plus 25% of the rest. Under plan B, Giselle would pay the first $70, but only 20% of the rest. For whatamount of medical bills will plan B save Giselle money? Assume she has over $70 in bills.

Click here to see answer by mananth(16946)

Question 393556: If 100-2xy-y^2=x^2, which of the following must be true?
a. x-y=10
b. x^2+y^2=100
c. (x+y)(x-y)=100
d. (x+y)^2=100
e. (x-y)^2=100
please explain how to solve this for me, its been awhile.
Click here to see answer by richard1234(7193)

Question 393565: I need to determine the slope and y-intercept of the following equation
2x+3y=5
I believe the slope is 2x and that the y intercept is 3y but I am not sure.
Thank you
Click here to see answer by rfer(16322)

Question 393589: The cost of a membership to a health club has an initiation fee and monthly dues. If the club charges $100 for 2 months and $200 for 6 months, then find the initiation cost and the monthly dues fees.
Click here to see answer by robertb(5830)

Question 393909: I am having a very hard time solving these types of questions and have spent the last two hours on one question and each time I get it wrong it gives me a new one to solve and I keep getting them wrong. Please help me understand what it is I am not doing correctly. Thank you.
I need to find the equation of the line containing the given point and parallel to the given line. Use y=mx+b form

Here is one of the questions
(7,9) x+6y=7
I know I then have to put it into y-y=m(x-x) form but when the x or y is by itself I do not know what to do.
Click here to see answer by solver91311(24713)

Question 394023: Using Substitution, solve.
x+y=4
y=2x+1
Click here to see answer by pie90010(44)

Question 394035: Solve using elimination process.
x+2y=6
2x-3y=26
Click here to see answer by pie90010(44)

Question 394042: solve using matrices
x-2y+4z=-8
2x+2y-z=11
x+y-2z=10
Click here to see answer by pie90010(44)

Question 394043: 4x-7y=10
y=x-7
Click here to see answer by pie90010(44)

Question 394038: Solve using substitution process.
15x-9y=-3
-5x+3y=-7
Click here to see answer by richard1234(7193)

Question 393904: Solve the system of linear equation using inverse matrices.
2x-3y=-2
3x-4y=9
Click here to see answer by pie90010(44)

Question 394069: Solve for v.
2v - 30 = 8(v - 9)
Simplify your answer as much as possible.
Click here to see answer by pie90010(44)

Question 394072: The surface area S of a right prism is given by
S = 2B + Ph,
where B is the area of the base, P is the perimeter base, and h is the height of the prism
Solve for B.
Click here to see answer by pie90010(44)

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