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

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Question 178476: which two equations represent parallel lines?
y=-9x+1
y=9x+1
y=1/9x+1
y=-9x+3
Click here to see answer by Mathtut(3670)

Question 178476: which two equations represent parallel lines?
y=-9x+1
y=9x+1
y=1/9x+1
y=-9x+3
Click here to see answer by cartert(27)

Question 178472: Graph each pair of equations on a graphing calculator using a window that shows the point of intersection. Use the intesect feature to find the solution
y = -3x + 51
y = 2x - 9

Click here to see answer by Mathtut(3670)

Question 178510: The sum of two numbers is 45. Their difference is 9. What are the numbers?
I need help with setting up this equation.
Click here to see answer by jim_thompson5910(28536)

Question 178257: Write a system of two equations in two unknowns for each problem. Solve each system by substitution.
The width of a rectangualr painting is two -thirds of its length. If the perimeter is 28ft, then what are the length and width?
Click here to see answer by ankor@dixie-net.com(15645)

Question 178486: An organization wants to sell tickets to a concert. It plans on selling 300 reserved seat tickets and 150 general admission tickets. The price of a reserved seat ticket is $2.00 more than a general admission ticket. If the organization wants to collect at least $3750.00 what is the minimum price it can charge for the reserved seat tickets?
i found that the reserved tickets will sell for $9.00 and the general tickets for $7.00 but i don't know how to make it an inequality or to graph that inequality.
Click here to see answer by stanbon(57282)

Question 178631: (7a+3)+(-a-5)=-16
Click here to see answer by Zef(4)

Question 178631: (7a+3)+(-a-5)=-16
Click here to see answer by Mathtut(3670)

Question 178560: 2y+{7[3(2y-5)-(8y-7)]+9}=
Click here to see answer by Fombitz(13828)

Question 178844: x=4
4x+ 5y=-9
Click here to see answer by Mathtut(3670)

Question 178885: A car dealership sold 650 cars in 1990 and 900 cars in 2000. Write a linear equation for cars sold. Use the equation to predict sales in 2004.
Click here to see answer by Mathtut(3670)

Question 178975: Graph x-y<=3 and x+2y>=6
Click here to see answer by stanbon(57282)

Question 179016: write an equation in point slope form and standard form of the line that passes through the given points: (3,9),(1,1)
Click here to see answer by checkley75(3666)

Question 179031: Can you please explain how to do this equation?
x=2y y=x-2
use the substitution to solve each system of equations. if the system does not have exactly one solution, state whether it has no solution or infinitely many solutions.
Click here to see answer by checkley75(3666)

Question 179040: in my math class we are solving linear equations using the subtitution method
there two problems i didnt get, this is one
x-3y=0
3x+y=7
this is the set of numbers and we have to solve for the x and y values of the number equations

Click here to see answer by jim_thompson5910(28536)

Question 179036: 3x-5y=11
x-3y=1
Click here to see answer by jim_thompson5910(28536)

Question 179034: 8x+2y=13
4x+y=11
Click here to see answer by jim_thompson5910(28536)

Question 179084: Use linear combinations to solve the linear system. Then check your solution.
x+y=4
x-y=-10
Click here to see answer by HyperBrain(694)

Question 179126: What value of "b" will make the system y = 3x +4 and y = 1.5x + b intersect at the point (5,19) ?
Click here to see answer by MissionPossible(18)

Question 179219: if I am graphing a linear equation and the answer is
-x=9 does that mean that the answer changes to x=9 since x can not be negative or do I have this mixed up with something else.
I have to graph the linear equation which is -x=-8y+9
When I do it I did it this way
-x=-8y+9
-x=-8*1+9
-x=-8+9
-x=1 is the answer, but does this change if there is a rule that you can not have a negative x?????
Click here to see answer by solver91311(16872)

Question 179246: i dont know how to do it
Click here to see answer by Alan3354(30993)

Question 179477: Computer Warehouse sells batteries ($3) and small boxes of pens ($5). In July, total sales were $960.
Customers bought 5 times as many batteries as boxes of pens. How many of each did Computer Warehouse sell?

Click here to see answer by stanbon(57282)

Question 179489: please help me solve this graphing problem
Solve the following system:
y = 2x - 5
y + 1 = 2(x - 2)

Click here to see answer by jim_thompson5910(28536)

Question 179497: 4x + 5y =40
6x + 7y =58

the same variable will satifty the solution
Click here to see answer by jim_thompson5910(28536)

Question 179505: I have this discussion question to answer and I am really confused by it. Your help would be appreciated.
Determine whether this statement "makes sense" or "does not make sense" and explain your reasoning. Because the percentage of the U.S. population that was foreign-born decreased from 1910 through 1970 and then increased after that, an equation of the form y = ax^2 + bx + c, rather than a linear equation of the form y = mx + b, should be used to model the data
Click here to see answer by eperette(173)

Question 179543: 3x+y=6
6x+2y=10
Use substitution method to solve this system
Click here to see answer by jojo14344(1512)

Question 179553: vx
Click here to see answer by nerdybill(6951)

Question 179593: Solve the system of equations using the addition (elimination) method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is "no solution" or "infinitely many solutions" and state how you arrived at that conclusion.
4x + 10y = 2
3x + 5y = 5

Click here to see answer by stanbon(57282)

Question 179608: y = 3x - 10
y= 2x - 5
i need to use this using the substitution method
Click here to see answer by Mathtut(3670)

Question 179767: i do not understand how to solve this problem y=x-9 x+8y=0
Click here to see answer by Mathtut(3670)

Question 179629: How do you solve this equations: For Y

1) x-6= -1/3y
2) x-7/2=0
3) 4x-3/8y=1
4) 4x/3=3y/4+1
5) 3x/4+y/2=6
Click here to see answer by checkley77(12569)

Question 179519: solve by graphing and find the two coordinate pair as a solution of the two equations below:
X-Y=-4
2y+X=5
P.S.- the coordinate pair as the solution must be the same for both equations
Click here to see answer by Fombitz(13828)

Question 179852: How do I solve. 3x=22-y
Click here to see answer by Alan3354(30993)

Question 179861: Find two numbers whose sum is 56 and such that one is 3 times as large as the other.
Click here to see answer by HyperBrain(694)

Question 179858: Ace Rent a cAR CHARGES A FLAT FEE OF $15 AND 0.24 A MILE FOR THEIR CARS. aCME rENTR A CAR CHARGES a flat fee of 29 and 0.14 for their cars. Use the following model to find out how many miles Ace Rent a car becomes more expensive.
c=15+0.24m
c=29+0.14m
Click here to see answer by Mathtut(3670)

Question 179943: 5x+4y=22

3x + 4y=10
Click here to see answer by Mathtut(3670)

Question 180071: When solving a linear equation in one variable, the objective is to isolate the variable on one side of the equation. What does that mean and give an example.
Click here to see answer by Mathtut(3670)

Question 180144: it a worksheet...
y=5x+5
y=15x-1

5x+5=15x-1
Click here to see answer by solver91311(16872)

Question 180219: I am so lost on this lesson. Help please! :)
5r - 4s - 3t = 3
r = 3s + 1
t = s + r
Click here to see answer by Fombitz(13828)

Question 180219: I am so lost on this lesson. Help please! :)
5r - 4s - 3t = 3
r = 3s + 1
t = s + r
Click here to see answer by stanbon(57282)

Question 180245: Solve the linear system by using substitution.
6x-y=-35
5x-2y=-35
Click here to see answer by jim_thompson5910(28536)

Question 180216: Find all x for which x^3-x^2-x+1 /x^3-x^2+x-1 = 0. Please can someone help me? I'm not even sure if this problem belongs in this section, let alone, how to do it. Thanks!!!
Click here to see answer by stanbon(57282)

Question 180450: The system y=3x+5
3y-9x+1=0 is?
dependent
consistent
inconsistent
equivalent
Click here to see answer by Mathtut(3670)

Question 180671: 2m + n = 1
m - n = 8
Click here to see answer by josmiceli(9664)

Question 180678: Could you please help me solve this, I have been trying for two days and I am not understanding what I am doing wrong. Thank you soooo much!!!!
THe directions state to solve each by substitution and determine whether the equation is independent, dependent, or inconsistent.
2y=x+6 (this is the first part)
-3x+2y=-2 (this is the second part)

Click here to see answer by Earlsdon(6287)

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