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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 463111: Given two points on the line, input the equation of the line in standard Ax + By = C. Reduce all fractional answers to lowest terms. (6,1), (5, 4)
Click here to see answer by amoresroy(361)

Question 463113: solve the system of equation
x+y+7z=-7
x+y+2z=-10
x-8y-3z=50
Click here to see answer by juliane1(5)

Question 463364: Solve a system of two equations by using the substitution property of equality
5x-6y=0
y=x
Click here to see answer by algebrahouse.com(1659)

Question 463370: Write each equation in the general linear form: y=-3x+9
Click here to see answer by algebrahouse.com(1659)

Question 463611: 1/x+1/y=8/15
1/x-1/y=2/15
solve the system
I keep getting x=1/3 and y=1/30
Click here to see answer by graphmatics(170)

Question 463611: 1/x+1/y=8/15
1/x-1/y=2/15
solve the system
I keep getting x=1/3 and y=1/30
Click here to see answer by Gogonati(855)

Question 463615: -3x+y=-2
y=-x-6
3x+7y=6
2x+9y+4
radicals and inequalities
quadratic functions
literal equations
exponential functions
Click here to see answer by Alan3354(69443)

Question 463586: determin the equasion of a line tha passes through (6,18) and (-12,3)
Click here to see answer by rfer(16322)

Question 463778: What is y= 2x + 3
Click here to see answer by Alan3354(69443)

Question 464194: Hello,
I think I know how to do problems like these, but I always seem to get problems like this one wrong. Can you help me solve this one? Then maybe I can figure out what I'm doing wrong.
Here's the problem:
3/y+2 + 4/y-3 = 7/y+6
Thanks.
Sarah
Click here to see answer by lwsshak3(11628)

Question 464227: Solve:
x+b/2y=-b^2/4
x-y=-1 where b does not equal to -2
I changed x-y=-1 to y=1+x
then; x+b/2(1+x)=-b^2/4
x+b/2+b/2X=b^2/4
x+b/2x=b^2/4-b/2
thats all I can do...

Click here to see answer by Alan3354(69443)

Question 464478: The difference of two numbers is 14 . The larger number is 3 more than twice the smaller number.Find the numbers.

Click here to see answer by amoresroy(361)

Question 464626: Solve the following systems of equations:
7x-6y= -11
9x-2y= 3
Also, can you please explain how to do a problem like this? That'd be great if you did! Thanks, in advance.
Click here to see answer by nerdybill(7384)

Question 464620: If the difference of two numbers is 49. The larger number is 3 less than 5 times the smaller number. Choose the answer with the correct system of equations used to solve this problem.
a. 5x - 3 = 49 and y - x = 5
b. x - y = 49 and x = 5y - 3
c. y - x = 3 and 5x + y = 49
d. x + y = 49 and 5x + 3 = y

Click here to see answer by Edwin McCravy(20056)

Question 464623: If the sum of two numbers is 42. The second is 10 more than 3 times the first. Find the numbers.
a. 12,30
b. 8,34
c. 12,22
d. 10,32

Click here to see answer by rfer(16322)

Question 464995: on saturday night, the manager of a shoe store evaluates the receipts of the previous week's sales. Two hundred fifty pairs of two different styles of running shoes were sold. One style sold for $75.50 and the other sold for $89.95. The receipts totaled $23,031. The cash register that was supposed to record the number of each type of shoe sold malfunctioned. Can you recover the information? If so, how many shoes of each type were sold?
Click here to see answer by jorel1380(3719)

Question 465060: y=-3x I am supposed to find the ordered pairs for this equation then graph them please explain the steps I am using course compass and it is telling me to substitute "-1" then "2" then "-2" into the equation for x. Is this true for all equations like this? I am confused because just last week he was saying that in order to find the pairs to substitute use zero confused...
Click here to see answer by edjones(8007)

Question 465113: Solve the system:
x-2y=1
2x+3y=23
I get it, but the answer is not coming out for me :( please help me :)
Click here to see answer by algebrahouse.com(1659)

Question 465170: Sir / Ma'am .. i don't know how to check this using substitution method .. it only needs to be checked.. here the problem :
4x+y+1 over 2 =14

Click here to see answer by MathLover1(20850)

Question 465149: Evaluate Dx
-4x+7y=1
25=2x+5y
Click here to see answer by ewatrrr(24785)

Question 465218: 1)A trapezoid has a based of x and height of 3 units. If there is also a square with sides measuring x,what formula would be used to calculate the total area of both figures? ^ this sign means to the power of or exponet
A) 9x
B) x^2
C) 4x+x^3
D) 1x^2+3
2)Evaluate x3y*x2y2
A) 5x3y
B) x to the fifth,y cubed
C) x to the sixth,y squared
D) xy
3)It takes Katrina 3.5 hours to drive from Davenport to Hogsdale and thaen 2 hours and 10 min to drive from Hogsdale to Paqua. On the route that she took,it is 720 miles from Davenport to Paqua. What was her average driving speed for the trip?
A) 100 mph
B) 60 mph
C) 105.5 mph
D) 127.05 mph
4)If a 30-foot flagpole casts a 12 foot shadow,how tall is a mailbox casting an 18-inch shadow?
A) 1 in.
B) 15 in.
C) 164 in.
D) 45 in.
5) In Coordinate system points A (-2,3) and B (6,-1) have a midpoint of X. What is the midpoint between A and X
A) (4,2)
B) (0,0)
C) (-1,1.5)
D) (0,2)
Click here to see answer by ewatrrr(24785)

Question 465297: how to slove x+4y=10 and x+5y=10
Click here to see answer by ewatrrr(24785)

Question 465551: Solve using any method. (x/2) + (y/3) = 2/3 and (x/5) + (5y/2) = 1/4
I cannot figure out how to do this problem I have been working on it for an hour and have not figured it out please help.
Click here to see answer by ewatrrr(24785)

Question 465956: 8x-12y-7x-8y+6-7x-2x+5y
Click here to see answer by sofiyac(983)

Question 466055: 3x + 2y = 2 -2x + y = 8
Click here to see answer by algebrahouse.com(1659)

Question 466023: If the ordinate equals the abscissa and x {-3, 0, 12}, which of the following sets of ordered pairs satisfies the given conditions?
{(3, -3), (0, 0), (-12, 12)}
{(-3, 3), (0, 0), (12, -12)}
{(-3, -3), (0, 0), (12, 12)}
Click here to see answer by ewatrrr(24785)

Question 466022: 15x+11y= 132
2x+3y=59
Click here to see answer by Alan3354(69443)

Question 466181: Solve the system of equations
{ y = x + 1
{ y = -4x + 11
---------------
x, y ( , )
Thanks!
Click here to see answer by asuar010(338)

Question 466169: Joe orders an 8 ounce martini that is 4.7% vermouth. sue orders an 8 ounce martini that is 100% gin. a martini is made with gin and vermouth. Joe and Sue give the drinks to Jane. Jane would like to mix a portion of each drink, so that she has an 8 ounce martini that is 99.8% gin. How much does Jane use of each drink?
Click here to see answer by ankor@dixie-net.com(22740)

Question 466358: 5 years ago, john age was half of the age he will be in 8 years.how old is he now

Click here to see answer by jorel1380(3719)

Question 466401: I can't seem to get this... any help would be appreciated...
Classify the function as a linear, quadratic, or exponential.

f(x) = (x - 2)(x + 6)

A)

Linear

B)

Quadratic

C)

Exponential

Click here to see answer by Theo(13342)

Question 466756: Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this.-8x � 4y = -68x + 3y = 16
I forgot how to do this...please help..
Click here to see answer by Alan3354(69443)

Question 466767: Use a Graphing calculator to solve the system:
√3x - y = 5
5x + y = 7
(The answer must be an ordered pair/ this symbol √ is suppose to be a square root)
Click here to see answer by ccs2011(207)

Question 466770: 4x + 3y + z = 25
x - 3y + 2z = -9
11x - 2y + 3z = 18
write solution as an ordered triple
Click here to see answer by Ryan O'Hara(46)

Question 466769: x + y + z = -2
2x + 5y + 2z = -16
-x + 8y - 3z = -44
(answer must be a ordered triple)
Click here to see answer by Ryan O'Hara(46)

Question 466857: Hello,
I have a question on solving linear equations. My answer is 4. I would to see if my answer is correct.
1/2(x+2) + 3/4(x + 4) = x + 5
Please let me know what you get.
Thank you
Click here to see answer by stanbon(75887)

Question 466908: Construction. Public buildings regularly include steps with 7-in. risers and 11-in. treads. Find the grade of such a stairway.

Click here to see answer by stanbon(75887)

Question 466968: i can't under stand if 3x+2y = -17
2x-5y = 14 the what is the process i can't under stand
what i need is Ex:
this i understand
X+2y=5
y=2x
X+2y=5
x+2(2x)= 5
x+4x=5
x+ 4= 5
5x and 5 divided by 5 y = 1 that i under stand but below i don't get it

THIS!!

Explanation:

Solving:
3x+2y = -17
2x-5y = 14

Using Substitution Method.
Expressing x as a function of y (from the first equation) x = (-17 -2y)/3
Substituting this expression into the second equation:
2(-17+2y)/3-5y = 14
Simplifying this expression:
(-19)y = 76
or
y = -4
Now, substituting y = -4 back into the x expressed as a function of y:
x = (-17-2y)/3 = -3

Click here to see answer by rfer(16322)

Question 466976: Post your 50-word response to the following: How can you determine if two lines are perpendicular
Click here to see answer by hhlebiczki(1)

Question 468075: y=-x+3
y=x+1
Click here to see answer by edjones(8007)

Question 468108: solve:
3x-4y=26
{
x-8y=22
Click here to see answer by ewatrrr(24785)

Question 468107: solve:
2x+3y=7
x+y=3
Click here to see answer by ewatrrr(24785)

Question 468082: i am having trouble solving equations. where can i get help to make them seem simple

Click here to see answer by rfer(16322)

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