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

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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 mananth(12270)

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(8909)

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(10682)

Question 393415: 2/3 of a number is 12
Click here to see answer by solver91311(16897)

Question 393422: Need help with solving this equation
0.3x + 9 ≤ 0.7x - 8
Click here to see answer by mananth(12270)

Question 393422: Need help with solving this equation
0.3x + 9 ≤ 0.7x - 8
Click here to see answer by MathLover1(6638)

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(57387)

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(12270)

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(5390)

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(12670)

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(4012)

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(16897)

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(5390)

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)

Question 394046: I am to solve the linear system by graphing for the equation 2x-2y=2 and 2x-y=6. I know I have to get y by it self to have it in y intercept form. This is where I am having problems. can you help.
Click here to see answer by solver91311(16897)

Question 394067: Simplify the following expression.
-4(-6v + u) + 3 (-6u - 2v)
Click here to see answer by rfer(12670)

Question 394066: Evaluate.
2 * 3 - ((-1)^2 - 4)^2
Click here to see answer by rfer(12670)

Question 393402: |7x-6|=0

Click here to see answer by robertb(4012)

Question 394047: Graph
y=-3x
y=4x-5
Click here to see answer by mananth(12270)

Question 394171: -11(m-3)-8m=-2(10m-9)
Click here to see answer by MathLover1(6638)

Question 394190: how to graph x-2y=3
Click here to see answer by ewatrrr(10682)

Question 394327: If y= 4x - 5 and 5y = kx - 25 are equivalent linear equations, what is the value of k?
Click here to see answer by ewatrrr(10682)

Question 394381: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
8x + 10y = 92
24x + 11y = 162
Click here to see answer by jim_thompson5910(28598)

Question 394424: y=6x
2x+3y=-20
Click here to see answer by jim_thompson5910(28598)

Question 394425: Subtract the lower expression from the upper one.

dy+az
ey-bz
_____________
Click here to see answer by jim_thompson5910(28598)

Question 394410: systems of linear equations and inequalities, please help me solve these equations, i'm stumped
#1 v-w=5
v+2w=4
#2 2g-3h=0
3g-2h=5

Thank you, Jack
Click here to see answer by mananth(12270)

Question 394447: what is the answer for [9-2x]=19
Click here to see answer by EricL(29)

Question 394455: The point (17, 0) lies on the line 8x + 11y = 136. Determine if this point is a solution of the system
8x + 11y = 136
0x – y = -8

Click here to see answer by robertb(4012)

Question 395130: what do the equations 3x - 2y = 3 and -3x + 2y = 2 have in common

Click here to see answer by stanbon(57387)

Question 395189: Amy paid $89.65 for a pair of running shoes during a 15%-off sale. What was the regular price?
Click here to see answer by mananth(12270)

Question 395268: 7[3m - (m + 2)] > -6(m - 3)
Click here to see answer by stanbon(57387)

Question 395302: solve by addition, indicate whether each system is independent, dependent or inconsistent.
-3x + 3y= -20
2x - 3y = 7

Click here to see answer by jim_thompson5910(28598)

Question 395356: Solve using the substitutiion method
-3x+y=4
x+3y=22
Click here to see answer by jim_thompson5910(28598)

Question 395354: loooking at the lines 0.11x-y=-0.85. are the lines intersecting, parallel or perpendicular?
Click here to see answer by jim_thompson5910(28598)

Question 395443: {(6 x -5 y=4),(6 x + 3 y=3)}addition method??
Click here to see answer by MathLover1(6638)

Question 395470: 9) how to solve y=2x+10 with the substitution of y=-2x-6
Click here to see answer by jim_thompson5910(28598)

Question 395472: You start a pet-sitting service. You spend 35$ on advertising & you plan to charge 5$ a day to watch each pet.
a) Write an equation to relate your daily income 'y' to the number of 'x' you watch.
b) Graph the equation
measurements:
y= 20 , 40 , 60 , 80
x= 2, 4, 6, 8
Please, help meee.
Click here to see answer by josmiceli(9697)

Question 395473: 2x-y=-3
x+y=9
Click here to see answer by jim_thompson5910(28598)

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